Practice the brief draft of the presentation again and again.Especially the keywords or the words that you might fumble upon.Practice as much times as you can for 2-3 days before hand. You will most definitely stutter but if you practice enough you won't stutter on the keywords which are important for the presentation to be at least understandable. Hopefully I could help you since that's the very thing that I used to do since the 8th grade and still do till this date(I'm 24 now)