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How to install a headliner
Remove the old headliner.
Pry off all the trim that surrounds the headliner and holds it in place. Detach and remove all of the seatbelt covers, lights, speakers, visors and clothes hangers.
You may also have to remove some of the upper a, b, c pillar panels to get the headliner to drop form the roof area. You may have to unscrew some bolts and/or pry some parts up with a flathead or torx screwdriver.