You get to the point where the headlamp is split into 2 after the oven. THe OEM projector is screwed into the headlamp assembly - unscrew the front 4 screws so that the projector is loose (but stuck in between the bracket and the reflector), and then unscrew the 4 back screws so as to disconnect the projector lens from the projector back-end.
You're then left with the OEM projector, in 2 pieces, rattling inside the headlamp housing. the lens part can be removed, and the reflector part of the projector can come through the back of the headlamp IF you clip (break) the cornes. This allows to totally remove the OEM projector WITHOUT touching the alignment screws.