I don't remember for sure but the easiest way to go about it is to remove the door interior panel.
There's 3xT20 or T25 screws at the bottom of the panel, 1xT25 screw next to the mirror and 2xT30 screws under the door handle. You pry the handle upwards just make sure you pry evenly or you can break off some parts of it which will result in a lot of vibrations if you like music.
Roll down your window for an easier time. Pry the panel off, starting from the bottom and when all quick mount clamps are out, you lift the whole thing upwards.
Disconnect all cables, the door latch and done, you can replace the buttons.