no special tools needed to remove the air bag.
on the back of the wheel, there are 4 holes, you stick a screw driver inside the hole, twist it, you will feel the bag pop up, hold it up, and hit the hole under it once one side its popped do the same with the other side. theres a spring lever inside, you turn it and you will feel the clip let loose.
i think i used a right angle pick last time i took mine off, a long flat head driver bit in vise grips works, done that, and then right angle screw driver, like to open a paint can works good as well.
heres a vid of how it works, there is no need to take any of the plastic covers off, you stick the tool through the holes in the plastic on the back of the wheel, im only posting this vid because he shows the guts, and how it works.
i know this is a regal, GP is the same thing.