Door panels are easy.
Just make sure you have all of the
screws out before you start pulling
on stuff.
The only semi - difficult part is the hand
crank for the window ( if you have one ).
Just put a tiny screwdriver in behind the crank
and pop out the little clip and it will slide right
off.
Door panels will feel like there are still screws when
there aren't. This is because they have clips (little plastic ones)
that snap into place on the metal. Pull them out carefully and they
will snap back on when you put it back.
If you are going to bang out a dent I suggest you roll the window
all the way up before taking the panel off or the glass will be in your
way.