Same situation, I had my thesis defense earlier and I think I have a few tips for you. I've learned some techniques from my speech therapist which I was able to apply in certain situations (mostly when I'm alone lmao). My anxiety really triggers when I'm in front of other people (I can't apply the techniques I've learned when I'm really nervous). So the night before, I recorded myself reading my script for the presentation smoothly. I recorded myself so that I can hear myself reading and at the same time, reading along with the recording in the actual defense. I think it's safe to assume that you don't stutter when you're reciting along with other people and recording myself and listening to it, mimics that kind of scenario. In the presentation, I told my panel about my impediment and they let me wear wireless earphones during the presentation. I couldn't have presented it any better, I didn't stutter at all during the presentation. Bottomline, Try to record a smooth reading of your presentation and listen to it while you're presenting in front. Hope this helps, Goodluck!