Assuming that your Safari is built the same as our Sovereign
, then to get the center ceiling panel out, you need to drill out a bunch of rivets that hold it up around the vents and a/c (if you have a roof a/c). Even then, it needs a bit coaxing to get it to release. We pulled it down in the center at one of the vents. Once it starting bending down in the middle, it pretty much fell out of the channels that held the sides up. Once the center ceiling panel is down, you do need to drill out the rivets that hold the trim pieces in place, as those rivets also hold the top of the side walls in place behind the trim pieces.
You will need to remove the door trim on the inside as well. It will pry out of the door frame. The trim is shaped like a "T", and is held in place into the door frame with spring clips that hold the bottom part of the "T" in the frame. Gentle prying with a small pry bar or stiff putty knife will coax it to come out. I think I used a painter's tool to start, and then a small pry bar.
Since you also have a '72, you may find some useful info on our thread: