I took the lining off to fix the ratling sunroof in my gf clio, it's quiet easy, you have to pull the rubber lining off the sunroof, remove the sunvisors with the scews (be careful not to damage the clips), and use a bit of brute force to pull the lining away. Remember, these things went in the first place so they must be designed to be removed as well
Clio's, sunroofs, leaking, creaking! - pain in the backside - thus, the reason when my gf replaced her clio for a clio iii, she said NO sunroof.
Good luck.