I'm currently working on organizing my writings and the info products I would like to create. The challenge with most big projects is that they not only have a lot of work to complete, but they have DIFFERENT tasks that need to be done.
Writing a book doesn't just involve writing. It involves brainstorming ideas, doing research, outlining the book, writing it (chapter by chapter, section by section), editing it, designing it, planning and executing the marketing and sales.
It can be overwhelming to think about all the moving parts, and I often find my mind racing between different concerns: worrying about the marketing while I'm outlining, or stressing about the design as I'm writing.
However, to produce good work, it's important to focus on the task at hand, and to work on each aspect of the project separately.
You need to wear multiple hats, but you can't wear them all at once.
What hat are you currently wearing? Is it the one you need to be wearing right now?
If yes, focus on the tasks related to that hat, then switch it to another hat once you're done.
I call this sequencing your concerns. Worrying about everything all at once will only lead you to get stuck. It's like throwing a lot of balls in the air hoping to catch one as they fall to the ground. The assumption is, with more balls falling down, there's a higher chance for you to catch one. But if your focus is dispersed across all the balls, you won't take action towards catching just one.
More is less, in this case.
You want to focus on one thing.
One task of the project that needs to get done.
Do that, then move on to the next.