I'm looking at replacing my headliner as well. I really suggest reading previous posts on this site. There seems to be a constant throughout each posting: patience.
I have none, so it's to the upholsterer for me.
Mark
68 Firebird 350 auto (sold) 70 Trans Am RAIII 400 4-speed (sold) 2011 Challenger SRT8 IE392 6-speed (sold) 2017 Challenger Hellcat 1966 Dodge Coronet 440