In my cooper, i can just open the boot, and to either side there are two panels that can be unclipped and removed, which allow access to the lights. Put your hand in and unclip the back of the lights at the top and bottom.... pull it through the hole and replace the bulbs, clip the light backing back in and close the access panel
A VOILA!
PS. for the rear Fogs that is, front is a different matter... Id like to know too!