2002 Jaguar Vanden Plas removing steering wheel

Want to redye steering wheel leather. Is it hard to take off? How to I remove it. I know there is an airbag that may go off. Do I need to remove the negative terminal from the battery and if I do will it effect the radios operation later. Will I have to also re-enter the radio code to make the radio work again? Please help. Or is it best to leave the steering wheel on and just dye with out spraying and will it still look good.