I had to give 2 presentations in a week in my university. I'm a moderate to severe stutterer I would say and I was really stressed about it. But what helped me is just practicing a lot in front of the mirror. Also before you start your presentation, say that you have a stutter. I said something like this; "hello everyone, before i begin with my presentation, i would like to say that i have a stutter, so don't worry if i get stuck on certain words, that's just how i speak. If everyone already knows you stutter then you don't have to do that but if people in the audience don't already know then it really helps. It prevents some annoying reactions from the audience and it helps you to be more comfortable and you Will have less fear to stutter because everyone knows already.