I just did my first upgrade on my MBP I upgraded the ram to 8GB very easy to do. I just ordered a 256gb SSD. I have been watching videos and read the apple guide on how to install a new HD. My question is when installing it Do I need disconnect battery? I also got the transfer kit as I'm hoping to upgrade before new os comes out. I'm going to be be backing everything up to my external drive before proceeding. Is there anything else I need to know? Will I need to reformat the disk to use it as anther HD? Or should I leave it they way it is as a back up?