I am replacing the headliner material in my truck. The original was falling down and I had thumb tacks holding it up. So I yanked it out and ordered some new material to put on the original backing boards, and it should be at home when I got there. Best price I found it for was a 60" x 144" piece off ebay for 58 bucks shipped.
These are pics from that thread link of the removal of the old headliner.
All Phillips screws on the trim pieces and visors and center light cluster. Need to unplug that and the pass side visor that is backlit. 3 oh shit handles use 7/16 hex head bots. I didn't need to remove any of the upper seattbelt harnes points to get this out, but probably the 2 top ones in the back seat to reinstall.