Got so excited planning I couldn't take it anymore. Wrote just shy of 1000 words today. The spreadsheet is around 90% done in terms of major story beats, and about 30% done in terms of minor ones. Thinking through that much has motivated me so much. Today's writing has gotten me through a prelude and a scene.
I may have even decided on a title. I'm fighting the urge to share it since it's way too early!