To be more exact, it involves removing most of the interior trim from that area, some electrics, drilling out several rivets, remove dozens of bolts and screws, may need to remove glass too, but the real fun is the butyl sealant, or black goo from hell. I sharpen a putty knife, coat it in WD40, and pound the shit out of it with a rubber mallet. They put it on thick, it sticks to everyfuckingthing, and it does not give up easily.
I hate those fucking panels and how difficult they are to work on so I removed all the sealant with a combination of liquid wrench, heavy duty engine degreaser, and many days of scraping black shit off everything, then replaced it with camper seal foam tape.