the panels use push in clips like these.
http://ohiomustang.com/store/order_page.asp?itemid=482
one end slides on the back side of the panel in those elongated holes, the other side snaps into holes in the door frame.
using a flat pry tool you located each clip and pop it out of the door frame with a little force.
work from the bottom of the door up around the edges. remember to remove all the covers and you will need to pull the window regulator handles. once the clips are popped lift the panel up and out of the way.
there should be the water shed membrane paper behind the panel, there should also be a Spring behind the panel on the window regulator shaft , this spring pushes the panel out to meet the regulator handle so it looks nice.
there are little things the reproduction panels do not have like the window whiskers, you will need to replace them they get riveted or stapled to the reproduction panel depending on what company you buy them from. there is also a top trim molding that includes the inside window whisker and it has a stainless steel trim top that sits on top of the panel. these get riveted into the repro panel
you will need to also locate the door lock grommets those get pressed into the new panel and then you spread the bottom out.
the devil is in the details, throw nothing out until the job is 100% completed and you are happy.
if you take the time then they look just as good as original panels. they are not perfect but unless you want to spend insane money for NOS parts they are the only game in town.
all the details is why it took me days to complete them. you may not realize you missed something until you put it next to the original panel and you notice the missing part.
today more parts of the panels are reproduced like the chrome carpet trim and the wood inserts, years ago they were not. so you had to mix more reproduction parts with NOS ford parts to get a good complete door panel.
my original panels
reproduction panels i spent days on making sure i didn't miss any details
prepping the doors
fitting the reproduction panels, sorry i don't have better photos.
after i finished the fit of these panels every couple of months new reproduction parts would come out so i kept improving the panels as time went on.
for example those door clips are suppose to have anti-rattle foam on them. AMK products eventually came out with the oem correct red door clips with anti rattle inserts. hard to see but the top 2 rows of clips are anti rattle, and they make a Huge difference of the fit and finish of the panels when you drive or slam the doors. (anti rattle)
you can make your own anti rattle pads, you need dense closed cell foam, cut into squards with 2 slits on the sides and it slides into the clips the foam sits between the metal door frame and the plastic of the reproduction panel, they also hold the panel tighter to the door frame.
the window regulator spring i found out about later and you install it after the panel is installed. you put the spring on the window regulator handle shaft with the narrow side towards the outside of the car, and twist the spring into the hole, once in the wide side pushes the center of the door panel out so it fits flush with the window regulator handle there is a chrome finish plate that sits between the door panel and the regulator with a teflon washer.
i did this 10 years ago so i'm sure i'm forgetting some more details.