I can't get my tail light assy off to change a bulb. I got both screws out, but it's still holding near the top. From looking on line here, I find out it's a plastic clip holding. It's really cold here now, I'm afraid I might break the clip off if I force it; which way does this thing have to move to disengage this clip? Does it slide down, towards the bumper, or straight out, away from the car, or what?