Removed the rear panels today so I can share some pics.
Using the trim removal tools that Don R suggests above is helpful. I bought this exact set from Amazon months ago probably from Don's previous recommendation. It's a worthwhile set to have at a minimal cost. I like have a set of plastic tools available for prying. Useful for a workshop as well.
As others have written before, start at the back end and pop open first and then it's very easy to pull on the rest of the panel to lever out. You can only use the removal tool with a few of the panel retainers when you start out because of the angle and available space, but that's really all that's required. You can probably get away without using this tool and just tug on it and it should pop off. Personal preference.
On the passenger side panel, one of the white retainers is missing.