I have been trying to remove my headrests and have had no luck. My car has seat covers that I want to take off but they were installed by removing the headrests. I even have a special tool that was used to remove the headrests by the previous owner. I just cant get it done. I have tried from the back seat and the front seat. I have read about "how to do it" on this site and still no luck. What am I doing wrong?