I have a 2003 Park Ave. I need to need to fix or replace thedoor lockswitch.. How do I get the door panel off?

Most modern cars have interior panels which hang on plastic arms and are fastened down by a few screws that are located under removable panels or lights. On your car,I think the panel with the window switches can be pryed up, and, if its just the switch, you can replace it without going further.