A decade ago, I really did believe that the average investor could do it himself. I was wrong. I've come to the sad conclusion that only a tiny minority, at most one percent, are capable of pulling it off. Heck, if Helen Young Hayes, Robert Sanborn, Julian Robertson, and the nation's largest pension funds can't get it right, what chance does John Q. Investor have?

It's bad enough that you have to take market risk. Only a fool takes on the additional risk of doing yet more damage by failing to diversify properly with his or her nest egg. Avoid the problem-buy a well-run index fund and own the whole market.

The purpose of investing is not to simply optimise returns and make yourself rich. The purpose is not to die poor.

All the things that make us human make us terrible investors and you have to understand what they are and how to avoid them.

You have to understand your own psychology. You have to understand that human beings weren't really designed to invest. We have all these emotions that are appropriate responses if you're being chased by a tiger, but they're terrible responses if you've got a 30-year time horizon to think about investment or when you're trying to manage investment over 30 years.

Do the math. Expect catastrophes. Whatever happens, stay the course.

A fast food job, for most people, should be an entry level position. If you see no path for advancement beyond that, it's time to take a real fast look at your human capital and learn a skill that will make you more money.