First, You'll need 2 screwdrivers, there are only 2 types of screws and they are very different from each other, don't worry about mixing them up

Flip you keyboard upside down. There are 13 main body screws, these are the big ones, they are all the same, remove them (2nd image)

There are 3 more screws grabbing the circuit board up left, they have smaller heads but are longer, no pun intended, remove them (3rd image)