You can do it your self, I have done mine and a few mates, I have posted these instructions b4 but here they are again.
Steering Wheel.
1.Disconnect the negative terminal on the Battery (important to neutralize airbag)
2.Locate the 4 mounting hole on the back of the steering wheel (2 left, 2 Right), you might have to use a torch to find them for the first time.
3.Using a medium size flat screw driver insert vertically into one of the mounting hole in the back of the steering wheel and twist, at the same time pull on the same corner of the air bag and it will come away slightly, do this on all 4 mounting points and the air bag will come off.
4.Disconnect the red horn plug and the red stereo control plug
5.Disconnect the yellow airbag plug at the airbag, it pulls out with a bit of force.
6.Undo the retaining bolt in the middle of the wheel (make sure that the wheel does NOT have its steering wheel lock on (ie have the key at the on position, nothing will happen with the battery disconnected, but the steering wheel will not lock.)
7.Make sure that the wheel is exactly straight before you remove it.
8.Remove wheel and transfer the stereo controls to the new wheel.
9.Fit new wheel and put a small amount of loctite on the bolt and tighten.
10.Reconnect air bag, horn and stereo controls.
11.Line up retaining clips on the airbag and push firmly on the wheel, they should clip into place and hold the airbag on.
12.Reconnect battery.
13.Take for a test drive and make sure wheel is straight. (Don’t be tempted to test drive with no airbag connected, as you will log an airbag fault, which will have to be removed by Holden.
cheers
Ralph