4 screws behind the steering wheel for the airbag - take that off
then coupla screws for the steering wheel controls.. either side and a small plug in behind the airbag...
They are not screws. There will be four holes so to speak behind the airbag, Each will have a metal locking bar. You have to use a small flat head, To pry it accross until it clicks out. It's a little tricky, But easy enough once you get the feel for how it releases.
Once off, You will have to discconect the earth i think, And the plug to the Clock spring. It's probably easier to remove the whole steering wheel at this point, As the steering wheel control wires run behind the plastic spokes of the steering wheel. Once removed it's very easy to see whats happening.
As for the battery, Just disconnect your airbag fuse.