What was the most challenging aspect of writing my book?

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Did you see my interview yesterday? If you can answer this guest, please do so. If not, no big deal.
Are you a writer? What's the most challenging part of writing to you?
Maybe you're not a writer, but there's something you do that's creative. What are your greatest challenges in that arena?
Don't be shy. Comment and share. 
I'll announce a winner tomorrow. 
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