DIY Investing: Is it really for you?

By Steve Lowrie, CFA

Special to Financial Independence Hub

Let us get something out of the way upfront.

Many do-it-yourself (DIY) investors do not need an advisor. They enjoy the process. They understand the risks and they successfully meet their needs over time.

Also true: many people who work with an advisor could probably manage their investments on their own but choose not to. They are looking for structure, coaching, planning strategies, process with structure, and a buffer between their emotions and their money.

And then there is a third group. These are investors who began managing their own portfolios, sometimes successfully, sometimes not, but are now questioning whether they are still on the right track. Complexity has crept in. Time is limited. Markets feel more confusing. They are not failing, but they are starting to wonder whether they are optimizing what they are doing and beginning to feel overwhelmed.

There is also a fourth group. These are investors who are managing their own portfolios but do not realize they are making mistakes. They are not actively questioning their approach because they believe everything is fine. Often, they are unaware of the behavioural traps, tax inefficiencies, or investment risks they have unknowingly taken on. It is only when a serious mistake occurs, one that threatens their financial future, that they start to seek advice. Even then, they may not ever realize or fully acknowledge where they went wrong.

If the third or fourth groups sound familiar, read on because this blog is for you.

When Smart Investors Recognize the Limits of Going it Alone

Some of my best clients have at one point self-managed a portion or all their investments. Many had built portfolios that were perfectly reasonable. Some described their results as poor, some average, others felt they had done well. But all of them eventually reached a point where they realized something was missing. They were spending too much time second-guessing decisions. They were reacting to market news more than they cared to admit. And they began to realize they craved the structure and behavioural coaching that professional advice can provide.

What makes DIY Investing so hard?

Dr. William Bernstein, a neurologist turned financial theorist and author, has written extensively about the challenges of investing, particularly for individuals managing their own portfolios. Bernstein is best known for books such as The Four Pillars of Investing and The Investor’s Manifesto and is widely respected for his clear thinking on asset allocation, market history, and investor behaviour.

In his view, only a very small percentage of the population is truly equipped to succeed as DIY investors over the long term. To do so, he argues, you need to possess four rare qualities:

1. An interest in the investment process. Not just in the outcomes, but in the work itself. Like how a gardener must enjoy digging in the dirt.
2. Sufficient mathematical skill. This does not mean advanced calculus, but it does require comfort with probability, statistics, and the often-counterintuitive nature of compounding and risk.
3. A strong grasp of financial history. Understanding past market cycles and common behavioural traps helps prevent repeated mistakes.
4. Emotional discipline. The ability to remain committed to your strategy even when markets are volatile or unsettling.

Bernstein estimates that only a tiny fraction of people possesses all four. Not because people are not smart or motivated, but because successful investing is as much about temperament and consistency as it is about knowledge. It is no wonder that so many capable individuals eventually seek professional guidance. Not because they cannot do it, but because they realize the cost of getting it wrong can far exceed the cost of getting help.

Personally, I believe Bernstein misses an important point. In my experience, even when someone does check all four of Bernstein’s boxes, the biggest limiting factor is often time, energy, and focus. Personally, many of my clients are highly capable individuals who could manage their portfolios themselves. But they choose not to. Not because they are unable, but because they would rather devote their time and energy to running their business, pursuing their careers, or enjoying other priorities in life. Delegating the day-to-day investment work and high-level financial planning is a strategic decision that allows them to stay focused on what matters most to them.

Most Investors do not get the Returns of the Funds they own

In your day-to-day life, you get feedback quickly. You make a decision, and usually that decision, especially if it is a business decision, you see results right away. You work hard in your career and earn recognition. But investing plays by different rules. You can make the right decision and still lose money. Or the wrong decision and still come out ahead. The feedback is delayed, noisy, and often misleading.

That is what makes investing such fertile ground for overconfidence bias. Most people believe they are better-than-average investors, just as most drivers believe they are better-than-average drivers. But that math does not add up.

In reality, most investors underperform the very investments they hold. Morningstar has tracked this phenomenon for years, as referenced in The Big Picture’s Mind the Gap article. Investors in mutual funds and ETFs often earn significantly less than the funds themselves deliver. The problem is not the products. It is the behaviour. Investors buy when markets feel good and sell when they feel scary. Put another way, they get caught in investment fads in up markets, and panic in a down markets.  Either way, they let emotions and behavioural biases interfere with execution. Even when they pick good investments, they struggle to stick with them.

The result is a silent drag on performance. Not from bad investments, but from poorly timed decisions.

Revisiting Hidden Costs of DIY Investing

In my earlier post, The Hidden Costs of DIY Financial Planning, I discussed how emotional decisions and inefficient implementation, whether through poorly chosen products or tax mistakes, can quietly erode long-term results. Those risks remain very real.

But there is another layer. Even if you build a reasonably well-constructed portfolio, if you cannot stay committed to it through thick and thin, you may never reap the full benefits. This is where structure and behavioural coaching often make the biggest difference.

What does it mean to get Professional Advice?

It does not mean giving up control. Most of my clients remain highly engaged in their financial lives but choose to delegate the day-to-day investment decisions and use a collaborative approach for major financial planning issues. What changes is that they no longer carry the burden of making every decision in a vacuum. They have a framework. They have someone to challenge their thinking. And they have a process to filter out short-term noise from long-term priorities.

This is not an argument against independence. It is an argument for knowing when independence becomes inefficient.

Increasing your Successful Investing Odds

You only know in hindsight whether your investing strategy was truly successful. Even then, it is often difficult to determine if your results were due to genuine skill or simply luck.

Why should the distinction between skill and luck matter if you have had a successful investment experience? In my view, it matters greatly when thinking about your future. If past success relied heavily on luck, your future results are less predictable and more vulnerable. And the reality is, most DIY investors do not have the time, skill, or desire to conduct a deep or forensic assessment of what went wrong, or to apply those lessons effectively going forward.

This ties directly into Dr. William Bernstein’s point about having sufficient mathematical horsepower to understand the investment process. In my experience, most people significantly underestimate the importance of understanding basic statistics and probability. And to make matters worse, most people are overly confident in their abilities: whether it comes to driving a car or managing their investments.

That is the true value of working with an advisor. It is not to guarantee results, but to significantly increase your odds of remaining disciplined, structured, and focused, particularly when it matters most.

If you are beginning to question your DIY investing success, let’s talk.