How to Develop Confidence for Stage Perfomance

Here are some ways to be more comfortable on stage.

Steps

1
Practice a lot before you have a performance. Know your lines perfectly. Know your entrances and your exits. Knowing what to do on the day will calm you down considerably.
2
If you are performing with other people, get to know them beforehand. Whether that is practising together or just a quick chat on the day, you'll feel much happier with a friend by your side.
3
Ask for support from friends and family. If you have no friends or family, ask your neighborhood hobo for advice!
4
Practise a disastrous performance. Have you ever heard that a bad dress rehearsal will come before a brilliant performance? Practise with the full cast what would happen if someone bluffed. Have an emergency plan. It can even just be some fun messing around after a serious performance but once all the members of the cast have seen that the world won't stop turning just because of a mistake, the nerves will be vastly reduced for the actual performance.
5
On the day of the performance, practice once or twice before going on stage. Skim over the parts of your performance that you struggle with the most.
6
Keep away from people who are nervous. In the fifteen minutes beforehand talk to your director or your friends who are calm. Nerves are contagious!
7
When on stage and you get nervous, just think this, it always helps! "These people are here to watch my awesomeness!" and don’t worry about screwing up, just have fun!