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I won't be half assing this repair. I can't stand the rattling and cracked interiors that I have seen over the years.
I'll head to the auto parts place tomorrow, if they are open.
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As everyone else has said, it's likely just clipped into place. I like to take a small screwdriver and VERY lightly poke around the bottom of the panel, it lets you find exactly where the clips are, then you can individually concentrate on pulling them free, and make sure you don't bend, crease or break the plastic trying to jerk it all off at once. It should come free with relatively little effort, if it feels too solidly fixed, I would look for a hidden or hard to access screw.
Finally, when you're putting it back together, if you get any rattles, you can use some stick on foam to tension the panel/pad it against the metal of the door and stop rattling. I've used this a couple times, including on my own truck, where the previous owner had wallowed out one of the holes in the door, for some reason.