Once you have all the screws removed, you can lift up the bottom cover from the back. Keep track of each screw and where it goes, because some of them are different lengths. Take your P5 pentalobe screwdriver and remove the screws around the perimeter of your MacBook. Flip over your MacBook so that the bottom is face up. This step is pretty much the same for any modern MacBook, except for the newer Touch Bar models (more on that below).
If you don’t already have one, it’s best to buy a kit that includes a P5 bit. P5 Pentalobe Screwdriver: Most MacBooks use P5 screws.You’ll need a few things before you get started, some of which you may already have.