Once you get the UTH, it'll come with instructions on how to set it up and what not. You can use a Thermastat, like Patricia said. I've heard they're much easier and you don't have to tweak them as much. If you don't have the extra money to get a Thermastat (Like me, lol.) get a lamp dimmer. You plug the UTH into the lamp dimmer, plug the lamp dimmer into the wall, and tweak with the little slider thing until you get your temps right.

You'll want to experiment with this for 1-2 days before you get your snake, in case something goes wrong