To take apart the controller you will need a Torx t8 screwdriver and a Philips head screw driver. There are 6 obvious screws on the back of the controller and there is one hidden and one behind the bar-code in the battery compartment on the back. Remove all of the screws, push down on the right and left triggers and pull the controller apart. Pull the board apart and don't worry you won't break anything unless you are really rough. Remove the rest of the buttons, they come out just by pulling them. You will need your Philips head screw driver to take out the D pad. There should be 4 tiny screws visible from the back. Keep your pieces organized and visible, you don't want to lose any of them.