Before we start working with the drive, we need to talk about static electricity. Your computer is highly sensitive to static shocks. This means that if you build up static electricity on your body and a shock passes from your body to something like a hard drive, that hard drive is dead and you will have to buy another one.
The way to eliminate static electricity is by grounding yourself. There are lots of ways to do this, but probably the easiest way is to wear a grounding bracelet on your wrist. Then you connect the bracelet to something grounded (like a copper pipe or the center screw on a wall outlet's face plate). By connecting yourself to ground, you eliminate the possibility of static shock. You can get a bracelet for a few dollars.