Walk The Talk means know how to ‘Direct’ the money – if you control the money, you control your career.
Every director should really understand the budget and learn the basics of film budgeting and cost reporting. You need to know this because then you know where you can take out things from the budget you don’t want (or can live without) so you can add things you do want.
I’m going to recommend a great resource on film budgeting for you. It’s a website and a book called “Walk the Talk“ by John Gaskin. His book is written in an easy reading style at a level appropriate for film students and crew who want to upgrade. It is also useful for Directors and new Producers who want some help with the basics of budgeting.
Also, here is an article John wrote called Film Directors – Direct the Money