I like to 'd'rop all my gold, #chat to the priest to get "two bits for an ale" or something, pick up (,) all my gold, #chat to the priest again, offer him all but the two bits for an ale, take out a potion of booze, drop it on the ground in front of the altar, and #offer the Amulet. At least he gets his ale...
Also, I said I use Wizard Mode, so I can pretty much get what I want, when I want it, how I want it. So I can wish for 50k pieces of gold, 'd'rop it all, ask for the two gold he gives, pick up my 50k gold, offer the 50k to him, 'ctrl-w'ish for a potion of booze, drop it for him, and offer the Amulet. And I ascend penniless.
And, if you ever do, DO NOT EVER AGAIN ZAP DEATH WITH A WAND OF IT!!!!!!!!!!!!!!! You only make Him stronger (and angrier).
Once you face Him, hope you have plenty of Potions of Full Healing. Not to use when you get gravely wounded, that's what your Blessed Tins of Nurse Meat are for. No, hurl those damn potions at Pestilence. They should hurt Him pretty badly. Pick up His potions of sickness after He dies before He respawns. He WILL drink them to heal.
Make sure you have lots of light food like BLESSED tins of spinach and K-Rations when facing Famine. His attacks will kill you a slow, hungry, painful death...