How to change for the first time a car's battery. I have a 02 malibu.?

I understand the basics that I need to disconnect the lug nuts off of the terminals, with the negative first and then the nuts then hold the battery bolted to the car. What I am somewhat afraid of:), since this is the first time I am doing it is to get shocked(literally) by the car's battery terminals as I am either disconnecting them or setting them to the side to take out the battery. If someone could give me some directions on how not to shock myself when I disconnect the battery terminals lug nuts as well as how and where to set the terminals(negative-positive) to the side while I put the other battery in it would be most helpful.