I get these thoughts in my head and it's like quicksand. The negativity happens when I design a book or sign up to compete in a triathlon with a longer distance or when I see a cute guy I like. Anytime I try to stretch myself, it comes over me.
I know some of these thoughts are wrong, but I also know some are probably true. I've attempted things in the past that I've failed at. Though I'm usually good about pushing through the fear but with writing a book, it's different. For one thing, it's a crapload of work down the toilet if I suck. For another, I have a lot more pride wrapped up in my writing than I do my triathlons.
So here's the question: How do you know you've got a good idea for a book? How do you know it's worth pursuing? How do you know you don't suck?