To become more confident, you need to be able to relax. Find a quiet room where you will not be bothered and set up the ritual or even meditation area on the floor. Don't ever focus on your flaws. Get more tips at http://www.ehow.com/how_2117090_gain-confidence.html.
Confidence comes when you do things repetitvely. This is true with everything in life. Theres an old adage, How do you get to carnegie hall? Practice, practice, practice. Practice makes perfect which gives you confidence. you can then do it in your sleep or even under pressure.
simple just be sure that your decision, the work you are going to do etc are 100% correct and automatically you will be confident about it. to be sure just ask ur heart and get confirmed from your brain.
at first do things that will give you success minute things.. later on these small things together give you confidence to do such things... and then add one by one to it( bigger tasks) to give you the feeling that you can do it...
do wat i did, work on w/e makes you the most UNHAPPY, for me is when i use to be fat, i worked on it and lost about 40 pounds, now i look good, well, so ive been told, and in turn my confidence went way up :3