As wamners says. It's not a 5 minute job. I used this guy. £190 for the headliner and £80 for the pillars. You can see the results in my build thread.
Range Rover Classic, P38, HEADLINING RE-TRIMMING SERVICE 2 Door, LSE
Range Rover Classic, P38, HEADLINING RE-TRIMMING SERVICE 2 Door, LSE