The interior door trim panel is held in place by a series of push-pins around the edge of the panel, you can pry them out using a plastic trim tool, or like I did here with a small prybar and rag

To avoid damaging the trim or the door, try to get the pry tool as close as possible to each clip then gently pry until it pops out

The trim panel separates below the top portion, so the lock-knob and window seal can remain in-place and undisturbed

Remember the trim panel is very-fragile and made of particle-wood, so handle it gently and place it out of harms way while you're working on the door