Scope the entire project into half days worth of work, aim at being in flow for 2-3 hours in each block. (Unless you are not used/trained in being in flow, then the pomodore technique might be better for you)

Lay out the entire 20ish blocks and post them here/email to your friends and family or to some other entrepreneurs that you do not want to dissapoint by not getting stuff done.

Every day, update the post/email with a status, did you get the blocks done and if not why not, what did you learn and what will you do differently tomorrow?

Good luck!