remove wheel arch access panel (2x cross head screws) (soak with release oil night before you try to undo them and clean the screw heads out)
might be easier to turn the wheel one way on lock to get at it easier...
remove cable plug from bulb holder
undo the 2 i think screws and release the lamp unit
refit in reverse order
it might be tight on the passenger side due to the washer bottle but see how you get on