Delbanco takes us into unpopular waters with "The Sincerest Form," but it is very much worth the voyage. Imitation is one of the most effective ways to learn, and this book can guide you where many, perhaps rightly fearful of [...], would be unlikely to take you. In a progression of exercises of imitation and revision, Delbanco shows how much you can learn from, well, from copying others. Incidentally, this is the only required text from one of my college classes that I have actually found useful. I guess that tells you something.