I use something like this. I have three of the snap on ones. The straight one is good for getting up on the clip. You have to apply pressure to the clip itself and not just yank on the panel. Sometimes the clips will release from the panel, but for the most part if you pry between the clip and the body it will release without breaking. You do have to kind of pull up on the panel a bit to get the tool under there, but not too much. If it feels like it is about to break then stop, because it is. Just take your time and it will come out okay.
Also, some people just will bend the deck pa el itself and pull it out without removing the side panels. If you see in the video when he removes the c pillar trim it just sits on top of the deck panel.