HELP - How to change the headlight assembly
 

Hi Eveyone wondering if anyone can help
My 08 TT , passenger side head light is cracked... :(
dealer told me it cost 900$ + , i was lucky enough to found anf bought an OEM headlight HID casing. but the question now is HOW to replace it? any special attention ? my car has HID Xenon with the road following feature, when turning the lens turn.
THANKSSSSSSSSSSSSSSSSSS :)