Nice shot of Tom waist deep in snake infested blackwater!
Gators, snakes, and what about snapping turtles? Sounds like fun! The general rule with these critters is don't bother them and they won't bother you. Keep your eyes open and don't move too fast and you'll be fine. If you're extra worried about snakes you could pick up some leather (or kevlar?) gators or chaps.
This page is full of real world wisdom on matters of working around venomous snakes:
Comments on protection from snakebite in the field
A couple of things to note from the above page:
1. Most people who spend a lot of time in snake habitat never had a snake strike at them.
2. People who had snakes strike at them weren't paying attention to where they were putting their feet while walking.
3. People who actually suffered a bite were usually wearing sneakers or sandals. A bare ankle is a typical place to take a bite.
My favorite entry was about a herpetologist who prefers to go barefoot in the rainforest. He said that a bare foot has a much lighter touch when it lands on the snake and the snake will be much less likely to strike than at a foot covered with a heavy shoe
A guy who works in heavy duty cottonmouth habitat says he says he sees them all the time and they've never struck at him. He says mosquitos are much more of a problem than snakes.
The vast majority of venomous snake bites in the U.S. result from people picking the snakes up with their bare hands. My favorite snake bite story is about a guy who killed a rattler he found in his backyard by cutting off its head. He picked the head up to take it as a souvenir and it bit him on the finger
Duh!!
-moss