You're going to do great. You're doing all of the right things in preparing, but now I think it's time to cut yourself some slack. I think it is a great idea to let people know you may stutter at the beginning of the presentation. This way if you do stutter it won't come as a surprise, and it won't interrupt the flow of the presentation. That's a very empowering move on your part. And honestly? If it happens, stutter your way through it. If people expect that you might, and you do, no one will think anything of it. The focus will be on the subject you present. Speak with passion and authority, and you will succeed. Best of luck to you, friend. You've got this.