Make your stage fright work for you
Fear requires a lot of energy. Instead of letting the fear undermine your talk, channel this energy in other directions. For example, using gestures to reinforce the main points of your talk can make it more dynamic. Communications consultant Richard Southern advises that you "get your body involved in what you're saying." This will add power to your presentation and keep your audience involved from beginning to end. Try to think of stage fright in a positive way. Fear is your friend. It makes your reflexes sharper. It heightens your energy, adds a sparkle to your eye, and color to your cheeks. When you are nervous about speaking you are more conscious of your posture and breathing. With all those good side effects you will actually look healthier and more attractive.
(Tom Antion, author of the article "Learn How to Be a Professional Speaker")