When I re-released Hungry Heart in March, I made a crack on Instagram that if you had the old version of the book, you should not make the scones. I was not kidding. Here's how I found the most embarrassing error of my writing career (so far): Before I published a book, I used to think that book signings would be the worst part of being an author. What if no one buys a book? What if no one even shows up? What if they do show up and I have to talk to them? I’m an introvert, FFS. I…