lol, I don't think anyone here will think you are any more of a worry wart than any one of us!
My Hot Rod was just under 3 lbs when he was neutered and did okay. He had 14 baby teeth removed too! He was kinda out of it for about 3 days but he wasn't sent home with any pain meds. I wished I would have insisted on it. Poor baby didn't want to be bothered. It will be hard to keep him quiet but obviously you will need to try. Can you set up some type of "stairs" for Harley to go up and down instead of jumping on the couch or bed (if that's what he does). Hot Rod jumped up and down on the couch a couple of times before I could grab him! Best of luck with Harley's neuter. Keep us updated!