Big things are brewing

Three days into 2008 and change is in the wind.
My boss has resigned.
This leaves a spot for me. I have applied, this is assuming I get the position.
The only problem is I'm having a big anxiety attack. I deserve the job, I know I do. I've been the assistant now for almost 2 years and worked very hard. I'm just scared. I'm nervous about the expectations and the big shoes left to fill. I'm scared that people won't really believe in my abilities and that I'll let them all down. I know they wouldn't hire me if they didn't believe in me, but I'm scared about taking the position and not living up to the expectations.
It's just different and more expectations....that's a lot of new stuff all at one time.