Unplug the cable from the bulb, this can sometimes be stiff, I've used a flat headed screw driver in the past.
Remove the rubber bit which goes around the back of the headlight
Unclip the bulb, it's held in by a strange spring type thing!
The sidelight is slightly lower down in a square casing type thing, I think you just turn it anti-clockwise 45-90° and then pull it out and remove the bulb.
Re-assemble in reverse order