I'm pretty burned out.

I'm right there with you. I could pass along the same advice that heaps of people have been giving me, but it sounds like you are in a much better place than I am at the moment. I hope that the satisfaction you get from this is worth the stress and exhaustion. It sounds like it is and it sounds like you are in a good place - both mentally and organizationally / technically.

The only word of advice I have for you is don't forget to think big along with thinking realistically. Allow yourself moments to let your mind drift and dream a bit - that's when the magic happens. While the thoughts that come to you in these moments may not become technically feasible now (or even in the future), sometimes constantly reminding yourself that XYZ is not realistic or ABC is impossible adds to your burnout / stress. One thing I experienced in film school was the value of the relationship between the producer and the director. The producer handles all the little shit and makes sure things get done on time and in the right way and all the scenes get shot. This allows the director to ignore all those details and dream big and be creative. Both elements are incredibly important to any big project - not just a film - and sometimes it's easy to forget that.

Best of luck to you, white and keep us updated!