A simple Google search will give you or anyone else for that matter, the most up to date info available on the treatment of venomous snakes.

A couple of things, first off, you DON'T use a tourniquet to treat snakebite. If you feel you must go against all of the current medical protocols, you might use a constricting band, which slows down the venom. A tourniquet cuts off blood flow and can lead to gangrene, amputation or death if used improperly.

The only method that should even be considered other than that which is recommended by medical professionals would be the use of an extractor, not the old fashioned suction cups and razor blade method.

You have much better than "half a chance" if you take reasonable precautions, are an otherwise healthy adult and use common sense while in snake territory. You didn't mention where you were going "deep in the woods" at, that will also help determine the odds of you surviving. There are only a few species of poisonous snakes in the continental U.S. If you're in an area not frequented by any of the poisonous species, your odds of surviving increase rather dramatically.

I'd also look up the latest statistics on venomous snake bite cases in the U.S., might make you more at ease when you realise just how few people actually die from them.

John E

P.S. Disclaimer: I am not a doctor, nor am I a herpetologist, but I am a nationally registered EMT and know a bit about treating snakebites.