First off, why do you want to remove the door panel?

There are 2 swiveling latches at the rear edge of the oval wood trim piece. They are about 1/4 to 1/3 of the way from the top and bottom edges of the trim piece. They will swivel up or down. Carefully place the thin bladed tool between the trim piece and the leather and slide the tool upward or downward and when you feel the small latch you just swivel it in behind the trim piece. After both latches are swiveled in you will still have to pry the panel out GENTLY as it is a tight fit. You will see that there is a fixed spring latch on the front edge. To replace this part you just swivel the rear latches back in their rear facing position, hook them under the door panel and snap the trim piece in at the front. It's rather ingenious.