From Andy Swan:

You know the story… XYZ is trading at 14.45 and you're SURE it's going to 20 bucks. So, what do you do? Naturally, you lever your buying power to the max, go "all in" on XYZ and then…

Flip out when it hits 14.22, realize the mistake you've made and sell all of your shares for a .23 loss, or about 4-5% of your account value because of the leverage.

Then, of course, the stock moves swiftly to 20.00 over the next month.

This CANNOT happen if you're going to be a good trader. You MUST MAKE MONEY when you're right.

There are a few ways to help yourself do this:

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More on becoming a better trader:

A trader's best friend

10 rules that can make you a better trader

Three bad reasons to become a professional trader