How do i get the headliner off....

 

Use an exacto knife, slice it down the middle, and pull it out in 2 pieces
Or you can try to search for the proper way to do it

 

teke out the middle light first.. pop the cover and use need nose and turn the metal clips out.. then pull off the rear seat belt covers. next take out the front too fold down mirrors/ sunvisors.. unscrew the 3 screws on both sides... there are 2 plastic clips the will hold the front up still.. just pull then straight down towards you and it will fall..... warning... these stock headliners are extremely weak... the brake apart really easy.. so be careful

GL

Douglas

 

The short answer:

Remove the stuff holding it into place (yes, it's really that easy).

Long answer:

http://www.iroczone.com/technical/headliner