Like most of you, I believe every writer should do some self-editing to ensure a piece is the best you can make it before seeking feedback from others. (I also believe that other eyes are essential, and that self-editing alone will generally not result in a manuscript that it is the best it can be. But that's a topic for another post.)
And like most of you, I also lean on expertise when I'm unsure of a rule: "when in doubt, look it up" is a core motto for editors everywhere. Below are a few favorite resources that I regularly turn to for help with micro issues--sentence-level editing.
Self-Editing for Fiction Writers
I sometimes call this book by Renni Browne and Dave King "a portable MFA." It offers some of the best insights I've come across to make your work not simply clean, but also polished and sophisticated. In fact, one of the most helpful chapters is titled "Sophistication." In it, Browne and King identify a handful of small changes that can make passages sound far more professional: avoiding "as" and "-ing" constructions (which place action at a remove from your reader), ferreting out weak verbs, paring back exclamation points and italics for emphasis, placing literary devices appropriately, and removing unnecessary repetition.
Their insights on proportion--giving actions, characters, devices, scenes only as much page time as is justified--are extremely helpful, especially when you're approaching revision and not sure where to start. When it comes to honing your narrative voice, the authors not only show how to improve, but also explain why some techniques are so effective. If you've always wanted to do deeper point-of-view writing but aren't quite sure how to pull it off, Browne and King's chapters on "Point of View," "Interior Monologue," "See How It Sounds," and "Characterization and Exposition" will guide you expertly.
Browne and King also cover some core revision concerns including show/tell balance, consistent point of view, and well paced dialogue.
Woe Is I
Subtitled "A Grammarphobe's Guide to Better English in Plain English," Patricia O'Conner's guide to basic grammar rules is, well, a lot more fun than you ever dreamed grammar could be. Her pun-filled chapter titles, like "Plurals Before Swine" and "Comma Sutra," lead chapters of no-nonsense advice full of funny examples and witty word play. Her special section called "mixed doubles" on homophones and other commonly switched pairings inspired my "Phonics Friday" series on homophone helps (which I hope are even a fraction as funny as O'Conner's chapter).
The material is grouped topically, though there's an excellent index if you need to find guidance on a particular grammar bugaboo. In addition to covering all the basics, from pronoun use, plurals, and possessives to verb tenses, modifiers, and punctuation, the book has several helpful chapters on frequently misused words and outdated grammar rules that need to be buried with that persnickety snob John Dryden and his ilk. And she clearly knows the sources of every outdated rule and why it needs to die--evidence aplenty to silence your uptight uncle who refuses to watch Star Trek because each episode opens with Capt. Kirk saying "to boldly go" rather than "boldly to go" (the bogus split infinitive rule).
If you are a grammarphobe, this is one grammar book that will leave you giggling, not whimpering.
What resources have you found helpful for sentence-level editing?