Now when you put the words "easy" and "headliner" in the same sentence, that's almost bragging. LOL. I have done several, and I would agree they are pretty easy, but you have to mark accurate centerline and have help.
Maybe easy compared to a mustang/cougar….mine had been folded in its box since the mid 90s and the test fit was to see if the 30year old wrinkles would come out when pulled….they did so the test fit became an installation….
