Countdown to... Hell?

In about 7 hours time, I will be conducting a training session for teachers from my department. I'll be speaking to about 45 teachers. Scares the hell out of me. It's the first time I'm doing something like this for adults. It's so much easier facing students. Well, I've already spent more than 1.5 days planning for a 5 hours session and I still don't think I'm ready. Sigh. It's gonna be a helluva ride. Just hope there won't be a crash.