Practice… Practice… Practice. First with an audience of 2… Then a few more… Then a few more. Work on tactful usage of pauses and breathing. Finally, as someone who had to do a public doctoral dissertation defense with very technical questions and a post presentation Q&A… Do you best. If you stutter (like I did) keep going. We fail when we make our personal reaction to our stuttering the main focus, so if you show you don’t care that much about it, no one else will either. Best of luck. May this be first of many victories.