To make it easier and faster than doing a full install, installing drivers etc - find an imaging program (if you don't have one), take an image of your disk, create a bootcd (imaging program should ask you to do this). Plug your new drive in, slip the cd/dvd into the drive, whatever you put your image on plugged in (if using external hd/usb pen etc), boot up from the cd, reimage the new disk, and your golden.
Wurz