What did I learn from botching my first novel launch?

Oh, the places we’ll go (in our heads) when we’re launching a first novel. Where did I go? Nowhere nice, friends. But I did learn a few things worth passing on.  What have I learned?  First of all, since this is my first novel, it’s hard to know whether my results might have been better if I’d done a better job on the cover or the book description — or on the writing of the novel itself. I had a...