To get the door panel off, normally you would use a special tool to "pop" the plastic clips that run along the bottom and side edges of the panel. However, you can just as easily take two screwdrivers, or files, or other strong flat tools, held close to either side of the clip and pry them out. They are a little tight the first couple times you do it, but just take your time and carefully pop them all out, then remove the screws that hold the door handle assembly to the door (I think there are two or three screws), and also remove the screw that holds the plastic piece that sits behind the handle that opens the door. The door should lift off the lip that holds it along the top edge. If you've missed a screw or plastic clip it should be fairly obvious at this point.