I'm guessing you're having Gingerpig lose his GingerNuts in anticipation of the day when he is Gulp Uncle Scruffy~less.
Dill was a good lardy boar when we had him neutered, about 13 months old. He had the trauma of losing his GP1 (we were going to neuter him sometime that summer because we knew he'd be alone at some time) We got the sows a few days before to give him a reason to rally.
Bert was already snipped 2 weeks before he came to live with us)
They don't need to starve we were told because they can't vomit. They need a snack and a water bottle for when they come round.
The vets made sure he was alert and eating before he was released.
He had a painkiller injection so we gave him Loxicam for the next 3 days (there was enough in the bottle for an extra day , much to Dill's delight, he glugged it. I didn't need to hold him , after the first dose he pootled up to the syringe 
)
He didn't have antibiotics
We used white towels under a cream fleece- easier to see any blood stains.
Plenty of normal lozenge poohs were deposited.
We stuffed toilet roll tubes with hay so he could pick at it (mine don't do hayracks either)
I think he was off grass for 5 days. He pulled out his own stitches when they were healed.
I read up on it, some vets leave the fat pads to reduce bruising (maybe they bleed more?)
It leaves them much tidier round the backend, they don't run the risk of impaction.
You need to check to make sure they heal up and don't get an abscess in the wound site.
We didn't have to worry about the other pigs annoying his stitches, they had to be kept in solitary anyway.
He'll be sterile in 4-6 weeks depending which vet you ask
They are so funny when they pooh, their bums are higher up