That’s a fairly big job to do if your not use to striping cars down. Lots of odd clips and ways of holding things up .
Not to sure of a cost. When I needed a TVR hood retrimmed the cost was about £700.00 by a company near to me called Trimmainia. So a headliner might £250 to £350, but not sure. Have you tried a valeting company to clean it ?

Jon