I just had to give about 5 of them and I hate them but I feel pretty comfortable doing it. The key thing to remember is, you are the one with all the information that is why you are up there.
I just finished a professional selling class and all it was is trying to sell something to someone infront of the class. I don't mind speaking infront of people.
I'm a teacher, I do public speaking for a living. oOo:
I was never comfortable at it when in school. Always a sweating, shaking, nervous, pile of crap. (don't forget the red face)