Keep on practicing. It feels strange but it will help you move through your nerves in the defense. Here's the thing about the defense, it's your chance to talk about your work, have folks ask questions and give you the chance to dive into all you're been researching and writing over the last few years. It's going to be fun. It's one of the few times when you get to sit in a room with folks who've really considered your work. You've got this.