Shouldn't be too difficult (he says..) although I have no idea how the plastic padding on the standard wheel comes off the frame.
The main part of the wheel should just be a single nut on the steering column. There is a central horn push, which is held in by two small screws. Undo these before the big nut, but take the fuse out to avoid shorts.
Undo the nut a couple of turns and hit the underside of the wheel upwards with both hands. Take the nut off before doing this & you'll be in A&E with a nose job..!!
Make sure the wheels are straight before starting, too.
Have a play, it's not too difficult..
I think if you're replacing with a Moto-Lita or similar, I think you'll be needing a boss kit from them too?
Any use?