Pick a young mature heathy looking specimen. No rutting Stags that have been rolling in pish. We are not eating antlers. Biggest is not necessarily best.
Relaxed, unaware of your pretence
Instant/rapid death
My local master butcher would say get it up in the air and bled within 3 minutes of being shot and leave it there for 30 minutes. Maybe a bit extremist !
Clean gralloch.
Clean extraction. No dragging in the dirt. No big opening if there is a long/dirty route in any event.
Clean covered transportation
Get it in a ‘proper’ chiller quickly. Get it down to ~3 deg C as fast as possible.
Hang for x days.
Skin and butcher hygienically. Learn how to do the backstrap like a pro, it’s the money shot. Cut it full length.
Vacuum pack if freezing. But best if fresh.
Cook well, but resting is the key. Buy Otalengi seasoning rubs.