I had a speech class in college. I was really nervous about it. But honestly, I only had to speak infront of the class for my 5 speeches during the year. The first one your really nervous, and it actually gets less nerve racking each time. It really wasnt that bad, I think I may have stuttered less during those speeches than in my normal life. The key is to know where your block areas are going to be. Dont start the speech off with a word you know you block on, start with one you dont. If possible, use visual aids so you can look at something else and train your brain to not think about actually talking. When I was up there, I always looked over the top of everyones heads, there was a window and one time I almost lost my train of thought because I was staring at a bird perched on a branch lol. But I think the most important thing you can remember, is everyone is nervous. So remember to talk slowly and enunciate all your words. There were plenty of people who didnt stutter who got so nervous that you could barely understand them and they finished their speech waaay too early.