You need a torx bit to undo the screws that hold the airbag ( T50 if i remember right).Take the bag off then you can see the nut that holds the wheel on the shaft, undo that and depending on how tight the wheel is on the taper you may/maynot need a gear puller . You can buy the bit you need from any tool shop , either one or a set .
If you have a live airbag on your wheel be very careful, disconnect the battery and DON"T have your head close the the wheel at anytime ..