That is very true! And what I love about film vs. theatre. In theatre it's over and there's no record in film you get to keep it forever :)

The process- so normally you write first. You don't always have to have a full script but you do need an idea that you can articulate. You write the outline or a draft of the script and that's what you use to pitch to directors or producers to gain interest. This project is unique because one of my best friends is directing- but it actually made me work harder because if I'm going to ask a friend to help me I want to make sure they love it and trust me so I don't abuse their time and skill set.

The writing can eventually get locked BUT if there is a writer on set things can change all while you're filming. Or you may record different different lines and decide in the editing room which to use. I've only been creating independent film stuff so there is a more collaborative approach.

Every process is so different- sometimes a writer may get approached by a director to make something or an actor may have an idea and seek out a writer. But you don't go to camera (aka start filming) without a great script :)