Good luck! I have to do a lot of public speaking in my job. And I'm pretty shy about things like that. It does get easier. I agree about telling folks you're nervous, they tend to be really nice then. I also tend to be really friendly when I answer questions. Even if I think the question is dumb. It's better (when you're nervous) to just answer it and be sweet, than to get snippy. Remember too, if other students have to present they will likely be nervous too.

Good luck!