As someone who has stuttered their entire life, I have done numerous presentations whether it for work or school...some great ones, some not so much. Aside from practicing over and over, here is the best tip that I think will help you which has helped me get much better at public speaking overall over the course of my life: Accept the fact that at some point, you WILL stutter. Its unavoidable, and just come to terms with the fact that it will happen. I know that this is a situation where we are shooting for perfection, but moral of the story is that it's unlikely. thats cause we stutter! this shit is meant to be hard!! so just go up there and try your best and when you slip up, just keep chugging along. Having the mindset that you're just going to try your best will help calm those nerves more than you know and could potentially lead to you not really suttering much at all. YOU GOT THIS!!!