disconnect battery
wait 20 minutes
make sure you can still rotate the steering wheel
turn it so that you can get to the 2 torx screws on either side at the back that hold the horn/airbag in place
they won't come out
pop the airbag unit off, it may need a little persuasion but not much
unclip the fixing ring from the centre
this should simply pull off
now you can undo the wires
then undo the nut in the middle almost all the way
when it's loose, bang the rear of the steering wheel to knock it free
you can then remove the steering wheel
fit the new wheel
fit your airbag unit with the cruise control buttons to this wheel

job jobbed