The rise of self-publishing means more authors are taking on unfamiliar roles, with mixed results. To put it kindly. I’ll leave the marketing/promotion advice to others, but one aspect I can speak to with some authority is design. I’ve designed all three of my own books, assisted with several others, and worked on a ton of print jobs in a (miserable) former agency life. My first novel interior was created in Microsoft Word—which I don’t recommend—with decent results. Everything since, I’ve us...