Head liner drooping

Our '88 S10 is having sagging head liner problems. It appears that the cloth is separating from the structure underneath it, allowing it to droop and even touch our heads. Is there a way to fix this back to the way it normally was? Does it require any special tools to remove it? or is it better to just find a replacement?
Thanks in advance.
Rex

If you want it to look professional, take it to a shop that specializes on the interior. A lot of autostores sell them push-pins that you can use to hold up headliners. In the past on some of my old vehicles, I tore the cloth part out and left it that way. I guess it depends on how you want it to look?