I have done this, took maybe 20-30 minutes. Pretty sure there is a 'how to' on here but basically do this:
Note: The controls are bought as a pair i.e you cant just buy the right side.
1. Disconnect battery and leave for 20 minutes (better safe than sorry).
2. Remove SRS fuse (under dash)
3. There are 4 clips holding the airbag on the back of the steering wheel, they unclip with a small flathead driver (move clip to the outside of the wheel to disengage). Note - It is easiest to do one side, then the other, rather than top / bottom.
4. Remove airbag and connecting wires. Place it FACE UP somewhere.
5. Unplug and remove controls (2 screws each) and burn them.
6. Install new controls and connect everything. Just a reverse of disassembly of course.
Yes, disconnect battery , take wheel off. It's not inevitable IMO.
Have to correct you Baba. No, you do not have to take the wheel off and for VY/VZ, if you use the controls breakage is a matter of when, not if. It's usually the +vol one too :/
Please don't blame me if something goes amiss. The 'how to' is on here somewhere I'm sure. Airbag just pushes/clips on.
*EDIT* Found this 'how to' with pics. It is for removing the steering wheel so you only need the first few steps to do the controls.
https://forums.justcommodores.com.au/threads/guide-removing-vy-vz-steering-wheel.79695