Well once you have removed all the brackets and runners and separated the back from the base you need to peel back the seat cover removing lots of little retainers. Now the foam is exposed get hold of your mothers/wifes/girlfriends sharpest serrated knife from the kitchen and start cutting the foam bolsters to size. After that it's a case of getting the seat covers to fit again. I managed to get the misses to sew the back one so it fitted snuggly but for the base I just pulled it as tight as possible and re-fixed it to the base metal using the runners and drilling small holes to reuse some of the retainers in different locations. A good strong pair of needle nose pliers is a must. I'm not worried that it looks a little baggy around the edges of the base as no one will be able to see that once fitted to the car. I didn't take any images but will when I get round to the other seat one afternoon when I'm bored.
Hardest Part?!?
Getting the missus to do a bit of sewing!