done mine today, really is a doddle, i know absolutely nothing about cars, engines, electrics etc. I also did mine on the VX dealers forecourt (in case i broke anything, which i did!), in the pitch dark with only a mobile fone as a torch. The switch by the clutch pedal was covered in that furry gaffer tape stuff and was bit of a pain to get off - the switch in the steering column was easier to find as it had a nice bright blue plainly removable block sticking out of it.
funnily enough when i had CC on my old Astra Coupe i never once used it but with all these "Average Speed Checks" on motorway roadworks now, i think i will be using it quite alot - 2 different ones on my daily commute (A2 Kent)