I know how to do it, you can't rush though this either.
Step 1. Remove the front, rear windscreens and door pinch welds.
Step 2. Once all of these are removed, CAREFULLY pull the headliing away from the front, rear windscreens and above the doors, where its glued on.
Step 3. Now work your way from the back of the car to the front, pull the listing wires towards the back of the car. In turn this will make the wire sag the worng way of the roof shape. I think there is 4 of these.
Step 4. Once all of these are pulled off there clips, pull the ends, again CAREFULLY, off there retainers. Once all are done, the headlinning is out.
Now this is for vinyl headlinning, with velour, be extra carefull, it can rip easy