DIY Investing: The Honest Lessons That Humbled Me

Why DIY Has Never Been Easier — or More Tempting

When I started in this industry in 2003, doing it yourself meant phoning a stockbroker, paying hefty commissions, and squinting at prices in the next morning’s newspaper. Today you can open an account on your phone in minutes, buy a slice of a global index fund for the price of a coffee, trade for next to nothing, and read more analysis before breakfast than a professional saw in a week back then. The barriers that used to keep ordinary people out of markets have almost entirely collapsed.

This is genuinely a good thing, and I won’t pretend otherwise. Lower costs and open access have democratised investing in a way that mostly favours the individual. But I’ve watched the same easy access fool a lot of people into thinking the investing got easier too. It didn’t. The tools got easier. The discipline it takes to use them well is exactly as hard as it always was — arguably harder, because there’s now so much more noise tempting you to act.

What DIY Investing Gets Right

Let me be clear about where DIY genuinely shines, because I think the advice industry is often too quick to talk it down. For someone willing to keep things simple — a low-cost, globally diversified portfolio of index funds, contributed to regularly and largely left alone — doing it yourself can be excellent. That investor saves the advice fee, understands exactly what they own, and is engaged with their own financial future in a way that pays dividends far beyond the portfolio.

In fact, I’d go further: a disciplined DIY investor running a cheap, diversified, leave-it-alone strategy will often beat a client paying high fees for a busy, over-engineered advised portfolio. The best version of DIY is hard to improve on. The trouble is that the best version is rarer than people think — because the things that derail it have almost nothing to do with knowledge.

The Lessons That Humbled Me

These are the lessons I’ve learned the hard way — some watching clients, some in my own account. They’re the reasons DIY is humbling.

Knowing the right thing and doing it are different sports

I know exactly what I’m supposed to do when markets fall 30% — stay invested, perhaps buy more. Knowing it doesn’t make my stomach behave any better than anyone else’s when it’s actually happening. The gap between the return an investment earns and the return investors actually capture, after their own mistimed moves, is real and it’s expensive. Most of the damage in a DIY portfolio isn’t a bad fund choice — it’s a good portfolio sold at the wrong moment.

Information isn’t insight

More data rarely makes for better decisions; often it makes for worse ones, because it breeds the confidence to act. The endless stream of commentary, forecasts, and tips is built to capture attention, not to improve your returns. I’ve seen sharp, intelligent people talk themselves into expensive mistakes precisely because they read too much and mistook it for an edge.

The hardest skill is doing nothing

Investing is the one area of life where effort and reward often run in opposite directions. The instinct to do something — tweak, trade, react to the headline — feels responsible and usually costs you, in fees, tax, and mistiming. Learning to sit on your hands through both fear and excitement is the single hardest discipline in DIY investing, and the most valuable.

You don’t know what you don’t know

This is the one that catches even capable DIY investors. The portfolio might be fine, but the tax structure is inefficient, the offshore exposure is accidental rather than planned, there’s no thought given to how it all lands in an estate, or the drawdown strategy in retirement quietly runs the risk of running dry. These blind spots don’t announce themselves, and by the time they surface they can be costly to fix.

Concentration creeps in

Left to our own devices, most of us drift toward concentration without noticing — we let winners run until they dominate, we overweight what’s familiar, we keep too much at home. I’ve made versions of this mistake myself. It feels like conviction; it’s usually just risk you’ve stopped measuring, a theme we explore in both property versus shares and the case for offshore diversification.

Where a Good Advisor Actually Earns Their Fee

Here’s the part that may surprise you, coming from an advisor: it’s almost never about picking better investments. If your advisor’s pitch is that they’ll beat the market by choosing cleverer shares, be sceptical. The real value sits elsewhere, and it’s mostly unglamorous.

It’s building a proper plan and the right asset allocation. It’s getting the tax and the structures right, and making offshore exposure deliberate rather than accidental. It’s the estate and drawdown planning that DIY investors so often overlook. And above all, it’s behavioural — being the steady outside hand that stops you selling at the bottom or chasing the top, the person who keeps you from making the ten costliest mistakes at the precise moments they’re most tempting. Study after study suggests this behaviour-coaching is where advisors add the most value, and I’ve seen it hold true in practice for over twenty years. The psychology of investing is genuinely the hardest part to manage alone.

One caveat I’ll always add: who you take this from matters enormously. Much of the advice industry is still built around selling products and earning commission, which is exactly the conflict that gives advice a bad name. As a fee-only firm, we’re paid the same regardless of what you hold, so there’s no product being sold here — just advice that’s actually about you. That distinction is the whole reason the value above is real rather than a sales line.

A Sensible Middle Path

The thing I most want DIY investors to hear is that it isn’t all-or-nothing. Some of the best outcomes I’ve seen are hybrids. You might run a simple, low-cost core yourself and keep a small satellite for the shares you enjoy researching — scratching the stock-picking itch without betting your future on it. Or you might happily DIY the straightforward investing and bring in help only for the genuinely complex parts: tax, offshore structuring, retirement drawdown, estate planning.

There’s no prize for doing everything yourself, and no shame in it either. The goal isn’t independence for its own sake — it’s a good outcome. If doing it all yourself gets you there, wonderful. If a second opinion or help with the hard parts gets you there with less risk and less stress, that’s just as valid a path.