I fitted mine, the instructions require 1 hole drilled for each of the mud flaps.
Only drilling into plastic trim under the car.
Front ones can be fitted by turning wheels hard right or left (depending on which side your fitting)
Rear fitting needs the wheels taking off. And you'll need a rivit tool for the offside rear.
I think those pictures have made my mind up - I'll get the mud flaps, Will also be going for the genuine ones rather than the cheaper E-Bay versions which don't look as if they're a good fit.
Question (perhaps only half serious), but if I fit them myself does this count as a non approved modification and threaten the warranty while if the dealer fits them I'm OK? I'm sure I saw somewhere that fitting means drilling metal (rust?) as well as plastic - but maybe I'm having another senior moment