The part that you do have to pop to remove the assembly, its a pretty strong part, BUT you might be able to find all of the arms on ebay.com from member heavenonearth. I've undid mine so many times thinking it would snap but it never does.
no other tips really, you must get underneath the projector to get to the housing unfortunately unless you have really small tools that can reach in to unscrew the screws and be able to lift and remove the ignitor from behind and out the back of the headlight. Just make sure you have the correct BOSCH or ZKW-Mitsubishi ignitor.
E92 335i 6spd
BMS JB4 stg 3, BMS DCI, CM methanol injection
04 M3 sold
03 330Ci sold