I used a Phillips head screw driver for most of the plugs on my sideskirt, you just have to be careful not to push up to hard as you're undoing them. The others you need to use a combo of screw drivers and pliers. If they are in OK shape after you get them out they can be reused but most likely you will end up replacing at least a few.
Wondering if there is a tool to remove those plastic push clips that secure the side skirts and the splash sheilds? going to replace one on my own and didn't know what to get.