It's probably unprecedented for a filmmaker simply to take the writers' script and treat it as the instructions on the package. What really happens is you pretty much suppress your own instincts - and your own views on the matter - and write things the way filmmakers would like to have them, though the filmmakers often don't know what they want. They can only find out by reading what you do.
I enjoy writing dialogue; it comes naturally to me.
I began writing for theater, and maybe because of that I've always thought of myself as a theater writer who does work in film sometimes.
I don't write at the library, because I smoke when I work or would like the possibility of a smoke. Also, I need to be at my own desk.