I've just gotten my first request to do a cover blurb from a relatively new author with a short history of pubbed books. With this person actually having books on the shelves (more than I can say), I'm not sure what kind of help I'll be. But I definitely know how hard it is to ask for blurbs so I'm inclined to have a go at it for the experience. What advice would you give a first time blurber? I…