on Jane Friedman site:
As a writing coach, most of my clients come to me after months, years or even decades of trying to write a book on their own and floundering.
I get it. I’ve written nine books and every single time I start a new one, I come down with book amnesia. I look at my published books on my shelf and think, “Are you sure you wrote those? Because you seem to have no inkling of how to write a book.”
So yes, writing a book is hard and if you’ve been working on yours for a while now, there are probably a couple of other issues getting in your way.