You will need to prop open the handle and drill out the two pop rivets holding it on to the door. It takes a larg pop rivet gun to reattach the handle. It should be a 1/4" drill bit to drill out the rivets. Let me know if you nee more help or information.
The handle should come out of this piece. I know that the handle is sometimes a little hard to get out of the door, but should come out. I think this piece is an optional trim piece on certain models.