If he's in good general health, it's very unlikely he will need live-in care. A few visits from a nurse during the first week should suffice to check on the catheter, the drain, and activities of daily living. Most guys have moderate to minimal pain, easily managed with ordinary prescription painkillers or less.
Preparing for surgery? It would be good for him to focus on getting into good physical condition -- two or three bouts of moderate exercise every day, good nutrition, good sleep. Discontinue aspirin and other blood-thinners well ahead of the day (he should have received specific instructions already). He should already be practicing Kegel exercises, completely stopping and then restarting the flow of urine multiple times per whiz.
Perhaps most importantly, he should be thinking ahead: First, he should imagine being temporarily tethered to a Foley (read up about it, and discuss with others), followed by a likely period of a few weeks or months with pads for incontinence, quite possibly accompanied by softer erections (or none) and orgasms that are unaccompanied by ejaculation. The more he visualizes these changes, and talks them out with sympathetic listeners, the fewer will be the unpleasant surprises as or if they become realities.
He should, of course, take time to complete an Advance Medical Directive and, if appropriate, a Medical Power of Attorney. Ideally, these should be completed well before the surgery date, so that he doesn't have them hanging over him. Doing them far in advance also puts distance between the unpleasantness of thinking about low-probability awful scenarios and the actual prospect of the surgery itself.