I'll break it down for you in terms that won't overtax your thought process. I've had over 15 years of experience doing this. If you so choose to pursue this hazardous path, then adhere to my councel young Jedi...otherwise your eminent demise awaits in the murky depths...
1. Use a drysuit with a dry hood, dry boots and dry gloves.
2.Use a full face mask.
3.Use a floating compressor with at least a 20 ft hose.
4.Have a quick release system for your air hose.
5.Use a weight 'harness' rather than a belt.
6.Use 'Force Fins'
7.Carry a first aid kit (with snake bite kit)
8.Carry a tool box for repairs.
9.Do not fear the dark.
10.Do not fear things that move in the dark. (Except Gators and Aligator snapping turtles.. Go right ahead and fear those)
11.Keep your cell phone on your float ...and your wallet
12.Use nets that will hold at least 300 balls at a time.
13. Hang the net around your neck, but have a quick release.
Be prepared to deal with continous repairs, thick weeds, tons of slime and mud, raw sewage, tree limbs, pipes, leaches, whirlpools, flying golf balls, dead animals, fish hooks, used syringes, sharp metal objects, pesticides, herbicides, bacteria, gigantic catfish, muscrats, snakes, bitchy golfers, primadonna golf pros, and most of all - 'Golf ball brokers' They are 'by far' the nastiest of all hazards you'll encounter.
Become at one with 'Murphy's Law'.. and 'ALWAYS' expect and prepare for the unexpected...