Hi, I would like to remove the cover on the garage door to locate the manual override. Right now, the remotes don't work and am unable to open the door without access to manual controls. It looks straight forward with a few screws but they seem stuck. So, help is needed on how to unscrew (loosen) these screws as they seem stuck. I have only tried with a screwdriver but it wouldn't budge. Any suggestions in any tips on loosing this?