Ask just about anyone and they’ll tell you they have above average intelligence. The phenomenon is known as “illusory superiority,” and it applies to many things in life, such as the aforementioned feelings most people have concerning their own intelligence and things like relationship status, professional achievement and one’s ability to drive a car — even terrible drivers think they are at least better than average.

According to a recent article by MarketWatch, the one area where even really smart people wave the white flag and admit to not understanding much about the subject is when it comes to money and investing, and saving for retirement.

Per MarketWatch:

“One of the most shocking things is the low-level financial literacy throughout our culture,” Puritz told the Washington Post. “It’s independent of education. Doctors, MBAs, corporate executives are incredibly competent in everything they do. But when it comes to investing, you run into this cauldron of mostly negative emotions, embarrassment, frustration, guilt. It leads to paralysis.”

If that sounds like you, well, you’re not alone. According to FINRA, two-thirds of Americans can’t pass a five-question financial literacy test.

Why? Because the fundamentals of finance are exceedingly boring. There’s is a wealth of information to learn and it takes a lot of time, time that most people don’t have or don’t want to spend.

The outcome is that even people with advanced degrees and professional success can fail at building a retirement nest egg. And they fail, interestingly, in two distinct ways.

Street education

One group tells themselves that they don’t understand money and delegates the responsibility to a professional. They get “a money guy” who seems to be capable of investing their savings and just forget about it for a few decades.

A second group does get a bit more educated, but it’s largely a street education. They open a trading account, plunk down a few thousand bucks and start hunting for stock tips.

Maybe the neophyte trader makes a bit of money or maybe he loses a bit, but he usually gets bit by the market bug and stays with it, buying and selling on his own with no help at all.

Both approaches are extremely risky, for different reasons.

The first group, by abdicating responsibility for their own money, can fall victim to scams. It happens all the time. Often, though, they get reasonably good investment help but pay tremendously high fees for what turns out to be average long-term returns.

The fees, of course, absolutely devour those returns. The typical investor pays 1% for investment advice and another 1% in fees for mutual funds bought in their name.

The result: One-third and up to one-half of investor gains is absorbed by fees. The “money guys” take zero risk (it’s not their money, it’s yours) but nevertheless get a huge reward.

The second group, the emboldened traders, also can fall victim to scams. Penny stocks, illiquid investments, and highly leveraged strategies are just a few examples.

Mostly, though, amateur traders fall victim to the DALBAR effect, named for the market research firm that tracks how dramatically individual investors underperform the stock market over time.

This happens because the small investor thinks he knows what he’s doing. So there’s lots of buying and selling.

Sweet spot

The extra effort rarely pays off. Over the 20 years ending in 2017 the S&P 500SPX, +0.42%   — the broad index of large U.S. stocks — returned 7.2% a year. That return is on track to double a nest egg every 10 years.

In contrast, DALBAR finds, the average individual investor saw a return of just 2.6%. At that rate, it takes 30 years to double the balance in an investment account.

Given the risks, what do smart rich people actually do? The key is to lower your costs, be consistent in your investment process, and of course to save enough to build a nest egg in the first place. If you can manage that, there’s a solid middle ground between doing nothing and doing too much.

The sweet spot is what we call “portfolio indexing,” a form of low-cost portfolio management that harnesses the stock market’s propensity to rise over time and lets compounding do its magic.

The final piece of the puzzle is to avoid emotional risk, the chance that you’ll end up selling when stocks fall. For many people, having a conflict-free financial adviser is the solution.

“Our front-line people are financial therapists,” Scott told the Post. “They need to be empathetic. People are very emotional about their money.”

Indeed they are. But there is an answer, which is educating yourself on how risk-adjusted investing works in the real world.

After a while, you will make peace with the process and grow to accept that an even keel makes for smooth sailing, no matter which ways the market winds blow.

Keep scrolling to read more tips to help you have the best retirement possible on Money & Markets.