I received my used handle and got to work today.
Door card removal = easy
As others have said, this is VERY fiddly. I have the slightly unique position in that someone snapped off my entire handle including the black prong that sticks into the door.
So I thought (wrongly) my best attempt was to take off the old hinge bolt (which after fiddling and swearing in the rain/dark) I managed to undo using an open ended spanner and sliding it up, undoing a little at a time until loose.
Not my next problem was getting the handle part of the duo onto my old lock unit which was in place (thinking I could avoid taking off the old lock part). I managed to detach the lock from the handle section but then quickly realised it would be a nightmare to do the same with it in position.
So tomorrow I am taking out the lock part after removing the rods and trying to stick it all back together again...fingers crossed for tomorrow and no rain!.
Found the black arm that normally goes into the door sat at the bottom of the door, after being violently pulled by an overnight Alfa killer!
Oh and two tips so far:-
1) I found it easier to cut a clean line on both sides for the inner liner, as even with a stanley the glue was staying put and very difficult to cut without touching the paint/tearing the liner. I will then reseal with some high quality water resistant tape.
2) To remove the lock part of the handle you need to remove the water proofing rubber which is held by 3 plastic clips and the top one. You can just remove the top one and the very left of the three and the torx will be visible. Reducing potential for damage.