Just had mine a few days ago! Youch!
I would suggest: a week off booze and fags before since both these can lead to excessive bleeding
a week off booze and fags after, same reason.
Loads of (proper) cranberry juice for the few days before and after - this will help keep infection at bay (some will say rhubarb and nonsense: ignore them)
A few jockstraps (eeeew, i know). NOT the same as tight pants - tight pants squash your cock and balls together; jocks create a kind of snug hammock - v. different. Should be changed every day.
A good supply of co codamol. (was my best friend all weekend). NOT ibuprofen or aspirin: both of which may cause bleeding.
At least 3 days in bed with a pile of DVD's: loads of rest basically. In these first days is when complications can occur - infection, excessive swelling etc; and there's a fair bit of stretching of tubes going on. The whole area from belly button down to and including your nuts may feel tender and needs time to settle down.
A cushion to stick between your knees when he's sleeping / resting to stop your thighs from squishing the obvious.
Don't shower or wash area for 48hrs (eeew again) so as to avoid getting stitches wet. Then - take it very easy and DRY DRY DRY like you've never dried 'em before (gently - obviously).
Oh, and tell him not to be tempted to knock a cheeky one out - we don't want to burst those stitches open now, do we?! Yeoooow.
TMI?
Good luck
p.s: No pressure to go back to work too soon if poss!