Stop in for a cup of coffee

You know since I can get around, I should pull the front seat out of my car and install the head rest's. Im kinda nervous to do so since I have to cut the seat cover. Wish I could just feel where they go and punch through but I dont think it will work like that..
Did it already have headrests? Trying to remember how they go together. Some kind of plastic inset with a metal clip... Just cut an x, not a hole.