Hiya
i had the same problem, all you need is a small flat headed screwdriver, push this up in the rear of the steering wheel where 6 o clock would be. then give the centre of the steering wheel a few taps upwards, the airbag and centre piece will lift off in 1, (i took my battery off to stop horn beeping, make sure you have radio code) steering whel bolt is a torx head (star) not sure what size.
2 min job though
marc the spark, October 2009