Headliner installation "can i do it myself?"

Yeah, being the cars from Arizona the interiors pretty rough. Clean body though. The headliners in pretty rough shape so will just have to put a mask on and start cleaning it out. Cant tell if its the insulation or a mouse nest. Then the previous owner glued carpeting to the dash so I dont know what to do there. Would be nice if it was nice underneath and I could remove the glue with some sort of chemical. Time will tell.