Be good if you could post a step by step bud, as wanting to do this soon ............
there is already one in guides. Basically undo the screws that hold the inner wheel arch lining. You don't need to do them all. Just the ones near the back of the headlight. If nimble enough you can then loosen the inner wheel arch lining and gain access to the back of the headlight.. Easier if you remove the wheel first