Here is where the awl will become your friend. The new headliner has covered up all your mounting holes for things like the visors, trim, and dome light. To locate the visor holes, the best thing to do is use your finger to feel for the large hole. Once you have found it, cut an X in the material. Now you can put your finger in that hole and find the backside of the screw holes for the visor. Now use the awl to punch a small hole in the material-just remember to get your finger out of the way first.