this is a bit of a penis to achieve given the tight spaces, but after paying some fat greasy hulk man at halfords to do mine, i felt confident to try it myself, after all if he can get his sausages in there i can get my little chipolatas in. make sure all the electrics are off, take the back covers off the lights, unplug the bulbs, then there will be two metal hooks holding a spring clip in place either side of the bulb, simply unhook these, remove bulb, don't drop the spring clip if it comes out,i did and was lucky to retrieve it. put new bulbs in taking care not to touch the glass, plug them in and replace the clips, test the bulbs and seal it all back up. easy.