for mine I ended up doing it with the bumper off which I have to say helped me out loads unless you have a ramp etc (I was changing my lights to Xenons at the time so perfect time to do it) I just ripped the staples out mate and replaced them with 10 or so self tapping screws from B&Q.
There is quite a few guides etc on cliosport, run a search for 'megane splitter' loads should come up.
Adam