iFixit.com has a great D.I.Y. section, you can go there to find out how to get inside the macbook. when your new drive is installed you will need to either boot off the old drive that has OS X installed or from the DVD. from there you can go into disk utilities and format the drive. It will be under the "erase" tab. then you can either copy the old drive by using a program like carbon copy or super duper. or you can run a new install from the DVD.