Headliner replacement

What are people's experience in replacing the headliner? I'm asking because I'm thinking of taking down the existing one to trace some leaks and want to know what my options are.

All this started by trying to rebed the windows since one of them was leaking and damaging the cabin trunk teak panel. I have one window out (it is a bear to get these things off). So a simple rebedding project is becoming a major refitt

Thanks,

dan