so,all i can say,its not as easy at it seems,but its not so difficult.
all you need is a dremel , stove (about 250°F) and 1 or 2 screwdrivers and a bottle of Plasti dip.also hot-glue gun and a good glue
take the dremel and cut the plastic all around the headlight,and then rip it off.
underneath is glue , then comes the front housing,then glue , then the main housing.
so you have to make it hot/warm and then spread out and cut the clue.its even hard to explain it in german,so in english much more...
if finished glue it together ( i took "pattex pa700" for glue,and then for sure to make it i took a hot-glue gun to make it leak-proof) ,paint the glue with plasti-dip and remount it in the car