Tip: Don't put kitty on any high places, and discourage jumping. They can easily fall because they're 'woozy'. If stitches are used on your boy(be sure to ask, because sometimes they do, sometimes they dont), make sure he doesn't take them off or lick them off to soon.
Get him a nice 'low' warm bed to which he crawl to and attack his favorite toy outta comfort(he probably wont use it though, lol)
But most importantly, give yourself a big HUG for neutering your pet!