Every puzzle gets easier once you find the edges. Figure out your boundaries first.

Knowing where something ends makes everything inside it manageable. Without a frame, all the options stay equally live and the work of choosing never stops. That is exhausting in a way unrelated to the difficulty of the task. Limits are not restrictions on the work, they are what makes the work possible.

Before you start, decide the edges out loud, how long, how much, and what you will not do. Say the hard one to another person so that it holds. The middle gets much simpler once the outline is fixed.