Here's a video with a tools needed list to help you through this:
Aluminum MacBook HD Installation
As far as discharge, touch something metal before beginning to touch the drive or other parts. The case is usually fine. Then do the work at a table while standing on a wood, tile, or concrete (hard surface) floor. Don't stand on fuzzy carpet shuffling your feet while a cat rubs up against you and your working on a fake wool sweater that just came out of the dryer that's draped across your bedspread. If you're still confused, read
Here.
By the way, both the discharge notes and the video come from macsales.com which is also a great place to purchase your upgrades. <~~ my opinion that's shared by many others in this forum. -GDF