Laura Anne Gilman
suricattus has some thoughtful advice on her Practical Meerkat blog over on the Book View Cafe about writers following rules, especially the one "Murder your darlings."
http://blog.bookviewcafe.com/2011/08/26/practical-meerkat%E2%80%99s-52-bits-of-useful-info-for-young-and-old-writers-week-34/#more-17915 An important paragraph:
Rules are helpful, oh yes. They’re incredibly useful. But they’re tools, not masters. Rules should be learned and internalized, not so that you can break them (another bit of oft-touted advice) but so that they become so much a part of your writing muscle that you adapt your work around them as you write.