One thing that has worked for me is that if there is any way you can get on the stage you'll be using so you can get an idea of what it will look like it might calm those jitters. The more prepared I am the better I feel. Make a list of everything that you think might go wrong and then address those fears one by one { or run screaming from the room - whichever you think will be more productive }. It's also nice if some friends can be down front so that you'll have some friendly faces to make eye contact with. Or else have your friends scatter throughout the crowd to get the applause going. That's called having a "shill" if I'm not mistaken. Let us know how it went - Good Luck