These lists are usually pretty lame, but this one had some good tips that anyone can start using right away. I'm going to start working on tip number 4:
4. Personal Commercial
One of the best ways to build confidence is listening to a motivational speech. Unfortunately, opportunities to listen to a great speaker are few and far between. You can fill this need by creating a personal commercial. Write a 30-60 second speech that highlights your strengths and goals. Then recite it in front of the mirror aloud (or inside your head if you prefer) whenever you need a confidence boost.
This works particularly well if Don LaFontaine narrates the commercial: