Whenever I've had a bun neutered I set up an indoor dog crate in the house for 2-3 days.
The bucks seem to fair better than the does, but a bit of tlc won't hurt!
Keeping himwarm for the first 24-48 hours is important as his body temp will be low cos of the anaesthetic.
I take out all the hay apart from some soft hay in the litter tray for them to munch on, and I put in vet bed or folded towels so that he has something soft and warm to lie on.
Most importantly I stock up on their absolute fave foods to encourage them to eat as soon as possible after the op.
Hope all goes well - bet you've had a nail biting day!