I do that kind of stuff at work all day. The most i work with is 1k watts. If you have a manual, (probally don't) to see the wring diagrams and schematics of what everything is its real easy.
Best thing to remeber is watts shock you, but current will kill you. And always try to use only one hand, if you use two and get shocked the electricty will flow throw one hand and throw your organs (heart, lungs) and out your other hand.