How to prevent ourselves from getting a nasty electric shock!!!!

Hi guys,
It's me, Calvin! As you kow, electric shocks can cause DEATH!!!!!!!!!!! So, how do you prevent them? It's very simple. First, if you do not need electricity to examine the wires, then switch off the main power first. Stop ALL electric flow in EVERY part of the house, just to play safe. Then, wear a rubber glove to protect yourself from any electric current still flowing in the wires. But what happens if you need the power supply on when you are examining the situation? Or maybe you need to test out the wires while examining it in order to find the problem behind it? Well, first, you can use a screwdriver which INSULATES electricity!! If you use a full-metal screwdriver, you will still have an ELECTRIC SHOCK!!!!!!!!!!!!!! And after you have the screwdriver, wear a rubber glove as well. REMEMBER: YOUR SAFETY IS ALWAYS NUMBER 1!!!!!!!!!!!!!!!!