IMHO I don't think that someone who has zero experience with computer repairs can handle a PB 12" optical drive replacement. The 12" PB is a complicated computer to dismantle and to reassemble. Replacing the optical drive means that the logic board has to be removed and you have to go thru a 54 steps procedure to do it. The internal wiring is hard to reinstall and there are many small and fragile cables connectors that have to be disconnected and reconnected in the process. I've done it many times but always needed high resolution picts as references to guide me when reassembling the machine.