Very easy diy job. Most of it is simply in a groove. Part of it down front edge of door is held in place by metal strip secured with several (5 or 6) little plastic pop-out clips; pop them out with glat screwdriver or flat bar. I replaced weaterstrips on driver doors of my 126 & the 123; little bit of weatherstrip cement helps at lower, front corner of door and around the door "keeper" bar (keeps door from swinging too far open) - elsewhere, no cement needed.