This is fun.
Disconnect battery
Get yourself a small flat bladed screw driver and in behind the air bag are four holes. In those four hole are metal clips.
You need to unclip one and you will see that corner of the air bag pop off a little then hold that corner of the air bag off the wheel.
Continue to the next one, pop it off then hole that whole side of the air bag off the wheel then same for other side. When your at the last clip the whole air bag should just pop off.
I am un sure if there is an eaiser way to do this but that way I did it above was a you know what. One thing is I found it eaiser up side down.
There is one big plug holding the air bag on so disconnect that and the air bag is free.
Disconnect the radio controls and the screw with the neg wire on it.
You then need a 30mm socket. I would not use an adjustable in case it slipped. Undo that bolt, it's tight. Once it's off wiggle the wheel and it should pull off the spline.
Make note of the direction as you don't want to put the new one on wrong.
Now one thing, when I put my wheel on there was a funny plastic grinding sound coming from in behind the wheel, kept driving thinking new wheel so it needs to where it, wrong.
Had to take the wheel off again and what it is there is a plastic ring on the very back where it butts up to the steering console, it was scraping so I took a stanley knife to it and shaved a couple of mm's off it and now it's as quite as a umm well quite thing.
You may want to do it first up just to save pulling the wheel off again or it may not happen at all.
To put back on just reverse the above.
I don't think I have missed any thing let me know if I have.
Hope this helps,,,
Windsurfing.....