The outer perimeter of the door has about 10 -12 plastic fasteners that look like christmas trees. The farther they are pushed in the tighter they grab. They are genrally best pried out by using a fork like tool with a v-notch that can get under the ears of the clip to force it from the hole in the door. Pry the clips so they come out of the metal door frame - not the cardboard backing of the door panel. You can rip the carboard and then the clip won't twist back into the carboard.
Keep in mind there may be hidden screws. Some are hidden behind the red safety reflectors, speakers, courtesy light assemblies, There may also be some through holes in the door pull levers or under a plastic retainer in the finger depressions on the armrest pull. I'm not sure which type of door pull you got but I gave you the basics. You might want to pull the ashtay out too & look through there as well.
If you got lights or speakers on the rear doors you'll have to unplug the wire harnesses, as well to remove the door panel.
After all the screws are out and clips freed from the steel door frame lift up on the door panel, Its helps to have the window down a bit. You may have to give it a good bump from the bottom - especially if this is the first time its being removed.
Any clips that stay in the door frame pull them out and twist them back into the backside of the door panel - if the hole hasn't been to destroyed. Once you get the door panel back on, line up the tips of the clips with the holes in the steel frame of the door & just give the door panel a bump with your fist all the way around the preimeter of the door panel. Then run the crews back in.
Good Luck
Harryface
05 Park Avenue 55,485
91 Bonneville 309,440