I Presume that you are referring to what we in the 'States call lowering the top... You didn't mention what year you have, so I'll tell you how my '96 works...
You don't remove the front part of the frame. You unsnap the fabric top from the frame, pull the pocket off the frame and just fold fabric part back. Store the frame in its normal (closed) position using the clamps above the windshield.
Then, you have to unzip the rear window and the side curtains, unsnap the straps on the sides over the doors and the snaps on the targa bar to lower the rear section. I just unzip the back window and let it hang inside the tailgate. I usually don't completely remove it.