Steering Wheel Alignment

Forum: 

Bought a 2007 Terios 1.5 SX for my wife last week, the steering was pulling and it had four odd tyres fitted so I had four new tyres fitted and the tracking done but the steering wheel is sitting off.
I would like to take the steering wheel off and level it but I'm not sure what precautions I have to take with regards the air bag.
Can anyone here let me know what is involved, I guess I will need to disconnect the battery but I'm reluctant as I don't have the code for the radio, then again I don't even know if the radio is coded.
Can anyone offer any advice.
Cheers Pat