Im looking to change the battery and the dc-in board magsafe for my 15' macbook pro retina laptop, apple quoted me 430 dollars, and im very handy with computers so i thought i would replace the parts my self. i have searched online and found many different answers. i Know the back case screw drivers are apples pentalobe type. i would like to know what screw drivers and their sizes for each of the screws inside the laptop and which size pentalobe screwdriver for the outside case. ive read that the battery is stuck to the front case, is it possible to replace the battery even ? Also which battery should i look for, i know its 85w one anything else i have to make sure of.