The headliner in a Ford Taurus is glued to the roof of the car in the cabin. It's also held in place by the trim around the outside of the vehicle. Since the headliner can easily be damaged, take your time while removing it. This job may take at least an hour to do properly. Fortunately, you only need a few basic tools to get started.
Wedge the trim removal tool underneath the trim on the pillars in the front of the Taurus.
Pry up on the trim to remove it. Repeat this process for all of the trim that overlaps the headliner. Work your way around the entire outside of the headliner, prying off all of the trim pieces that overlap or "connect" to the headliner.
Work the putty knife or scraper underneath the edge of the headliner and trim the glue off the edge.
Continue to work your way underneath the headliner until it begins to come free from the roof. When it is free from the roof, you can pull the entire headliner down.
