Get over the initial hurdle by making that hurdle as low as possible, and then keep clearing really easy hurdles until you’re an unstoppable force of nature. That’s one way to approach putting in the hours to work on your life’s work.
It doesn’t even have to be a full page. Half a page or even less. Call that a success. What matters is that you make time to write. Value progress, no matter how small. By showing up and working, you will make progress, everyday.