So you have to know when to stop. If you plan too far you lose the will to write and the magic that happens in the writing and the walls of fear start to go up and get higher and higher until even doing the ironing looks good.
So get a good handle on what the success factors are for the book you're writing, roughly lay them out. Enjoy your background reading until the point it gets quite obscure and you're in danger of being didactic. Cross the knowledge threshold and you're a preacher not a writer. So stay back in the realm of slightly unsatisfied curiosity and don't cross over into the vanity of the realm of being a know-it-all. Writers don't know it all, that's why they write books. Ok, writers aren't 'writers' like its a breed of livestock - they're people - who are telling a tale for two people and both those people are them.
All I know is that when I'm turning about myself like a cat, or the chocolate stash is...
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