You need a phillips screwdriver and (ideally) a panel clip fork. If you don't have one, you can either use a flat head screwdriver wrapped in a rag, or just pull hard.
There are 3 screws to be removed. Two are easily found on the underside of the arm rest. The third is behind the mirror control switch, which you pry out with a small flat blade screwdriver. With all 3 screws out, the arm rest comes off.
Next, slide the door handle trim ring toward the back of the car until it pops off.
Unscrew the door lock pin & remove it.
There are like 10 trim panel clips that need to be popped out. Start along the bottom. You can either pry at them individually with a rag-wrapped screwdriver, or take your changes pulling on the panel (usually rips them out).
Once the clips are loose, you lift up and it should slide off of the hooks it sits on.