The headliner in my 2001 DB7 Vantage is sagging in spots. I have no problem in bringing it down for re-gluing, but am unsure about the removal procedure. Read a thread on removing one from a DB9, but quite frankly it didn't make sense. Talked about removing sections of the dash? I have done this in Mercedes and Land Rovers and even with a sunroof it wasn't complicated. What am I missing before I go blindly into this project? I appreciate any thoughts.