I've taken off my bumper before a while ago, but last week I did it again and got stuck for a little bit at the same point. The whole bumper could wiggle a bit but I didn't remember how to get those clips to release after pulling on it a few times. I pulled really hard like I wanted to break it and they released just fine. Pretty sure that's how I removed my bumper the first time too. Just have to get angry! Your results may vary. No screw driver needed but maybe I already wore the clips the first time. Don't remember if I used a screwdriver then.