Not sure what year you are working but generally you would start by removing the trim around the door handle. A putty knife works well for releasing the tabs. Then comes the screws which hold the arm res in place followed by several screws near bottom of panel. Idealy, you have a tool for removing the plastic inserts that hold the panel to the door, but a wide blade screwdriver can be used if done carefully. Then it is disconnect the wires on the backside of the panel. These can be tricky, but usually you can see where to squeeze to release them.