I write screenplays that don't get made and pilots that don't get picked up, and I re-write other people's movies, and those are all different kinds of fees. ↗
For me, when working on a film or play or television show, everything for me starts with the screenplay and I am devoted to that and that is what I work from. Any research I do or any preparation I do on my own is all ultimately in service of that. ↗
I did all my directing when I wrote the screenplay. It was probably harder for a regular director. He probably had to read the script the night before shooting started. ↗