Disconnect the battery
Leave for 10 mins
Behind the steering wheel will be 2 bolts holding the air bag in place
Turn the wheel to access them
They won't come out all the way but when they are out you can pull the airbag off
Unclip the wiring
Remove steering wheel as normal
Undo the big but in the middle
Leave it in by a few threads though
Bang wheel from behind with the palms of your hand until its loose
Remove nut fully
Swap wheel