Never . . . EVER . . . worry yourself with a water moccasin while fishing. If you do, and you wind up tearing open a hornet's nest trying to get yourself out of the trees where you went to screw with the snake . . . concentrate on staying in the boat and paddling out of the immediate area . . . especially if the snake is now in the water, and mobile. Also, don't use teh truck battery to power the trolling motor, and if your friend asks you whether or not he's swelling up from the stings, tell him the truth . . . even though it's his birthday.
Here's one I learned this weekend on the long trip:
Never assume that you're 'safe' because the guy in front of you on the interstate is going faster than you. The plane/rolling road block sees all . . . knows all.