In Australia we are lucky enough to have most of the most poisonous snakes in the world- they are protected, and usually if bitten there are long distances to travel for medical attention.
I find a little bit of common sense, wearing long pants, chaps and boots goes a long way.
I also try and avoid doing stupid things like poking around old bits of corrugated iron roofing material etc that have been on the ground for ages.
I also carry a thick crepe bandage to bind a limb if bitten.
Interestingly the Aborigines used to lie still for a couple of days if bitten. This reduces the capacity of venom to move from the capilleries into the blood. The poison has a half life that once exceeded can be easily passed by the body.
Of course if a major blood vessel was bitten it would be all over bar the funeral.