Yeah it's a pain. I took an appropriate sized wrench and did it in baby turns. It took forever. Just be patient. I have really big hands, but I dropped the glove box and reached it that way. My Sony head unit I put in had a screw hole in the back, and I had a small screw that fit it. (Amazing, I know.) So I put a washer and a nut to hold the washer in place and tried to get it started through the center anchor hole, but after 20 minutes of fumbling and cussing, I figured that wasn't happening. So I got a slightly smaller, longer screw that would bite the threads, but could be pushed to angle one way or the other, and put a washer on it and just forced it over the top of the anchor. It's easier to remove than a screwed-on nut, but it keeps pressure on the radio and makes it impossible to pull directly out.