Good luck! I don't really have advice for you that has not already been given. All I can ad maybe is that if everything does go to shit, thats okay too. I had a mandatory course in psychology on conflict management, where we were put in a real life situation with two actors and were graded on how well we handled it, with the whole class watching. I had so much anxiety in the lead up to it that once It was finally my turn I could barely think straight. Blocked, stammered, stuttered, and uhhmmmmm'd my ass of like I have never before in my life. Thinking about it still sends chills through my spine and the worst thing is I was forced to relive that moment because we had to record it and transcribe it as part of the assignment. End result, I easily pass the assignment, nobody seems to care about any of my stuttering, everyone still likes me, and I took valuable learning out of that situation which has helped me Improve in all kinds of similar high pressure situations or calling people on the phone. Sorry for the long rant! Hope it helps you in some way. Again, good luck tomorrow! Whatever happens will be fine either way.