Some other great advice on here, practice, know what you’re going to say, leave the difficult words for q&a. In my experience though the best way to combat anxiety based stuttering is to get rid of fear by way of extensive content preparation. Know your stuff, in and out, and know it some more. You’re the captain of this ship, and you owe it to yourself to leave absolutely no doubt as to how well prepared you are on the subject matter. That helps a lot. Finally having said that, if you do stutter, take it in your stride and just move on. Take your time with words and sentences and accept instances of stuttering as events and not as failures. You got this.