Easy, put your wheels in straight ahead position.
Prise off the horn button and disconnect any wiring.
You'll need a 21mm socket ( I think) to slacken and remove the central retaining nut.
Once the nut is off, you can employ a special "puller"(don't ask me where to get one) or you can GENTLY ROCK AND/OR TAP THE WHEEL backwards and forwards to release it from the splines. DO NOT USE EXCESSIVE FORCE.
Take your time because if you damge the splines then replacing the wheel will be a nightmare.
Putting on a new wheel is just the reverse of the procedure listed above. Ensure that the steering wheel position is correct when the wheels are dead ahead. As you TAP the new steering wheel into place, be sure to keep it as in-line with the splines as possible.
Don't give the nut the final tightening until you are sure that the wheel is in the correct position, ie centred with wheels straight ahead.
I did this job once and I had to re-position the wheel a couple of times before I was happy.
Good luck
John