if they have never been removed before it will seem a bit tricky
the blackstrips are held together at each joint with tape on the underside. not much you can do about this until the strips are removed
and the way to do so is to remove the shortest and smallest strip you can, i think they are the corner black strips, once they have been removed
the others are basically held on with clips
you have to SLIDE the strips off, do not yank and pull it out, they SLIDE out!
putting them back in and making them sit flush is the hard part