Nervous About Neutering

Well, its finally time for Psi to get neutered. He's getting it done on Thursday. I'm really nervous about it...

I want to take him in the earliest I possibly can and they said we can pick him up between 4 and 5 in the afternoon. What can I expect after his surgery? What is the schedule of him "waking up"? How long until I should worry about his grogginess and when will he be expected to be back to eating/drinking/peeing/pooing and just being Psi again? Will it be okay for me to leave him alone on Friday morning for a few hours when I go to school? I have to leave again Friday afternoon for a few hours too but I'll be able to check on him after school, will he be okay all alone? I plan to stay up with him all through Thursday night. He'll have stitches, right? How long until they will come out or will the dissolve? Will he have to wear a hood so that he doesn't pick at them?

Okay, I know I asked 500 questions but please help me feel better about this!!!

Thanks,
tanyuh