Right now I'm in Victoria, B.C., which I tend to visit about once per year. Victoria has marvellous bookstores including independents Bolen Books and Russell Books, as well as a massive Chapters with a good view of the main downtown street (go upstairs, have a coffee, and people-watch your heart out.) Because of this, or because I'm a bibliophile anyway, my tradition when I'm in Victoria once yearly is to go through all of these bookstores and buy myself a magazine, the newest Get Fuzzy collection, and a writing book.
I have very few writing books that I find useful. I could spend ages reading through other people's advice on writing, but for reasons related to my previous post on editing, I think it's a bad idea. My time will be better served writing, or at the very least getting involved with a community of other writers, not authors far away, where I have their words but can't discuss or get feedback or question what they've said.
The few books I like, I adore. They include On Writing by Stephen King, Self Editing for Fiction Writers by Renni Brown, and How Not to Write a Novel by Howard Mittelmark. Each of these titles have helped me with my craft to an extent beyond making me feel good about thinking about writing. I think the first two are absolutely necessary for fiction writers, and the latter is both useful and pretty damn funny, too.
I also have a few favourite books that act more like writing prompts. The Pocket Muse by Monica Wood provides photos and words to nudge creativity without giving explicit writing exercises. The 3AM Epiphany by Brian Kiteley is full of real writing exercises, each explained and put in context of the part of the craft they exercise. Both of these books can be taken seriously or not, and I love that type of prompt, when it's still mostly up to my own imagination.
It's this latter kind of book I picked up on this trip. In fact, the first book I picked up was The 4AM Breakthrough, again by Brian Kiteley. More lovely exercises! More wonderful thought-provoking prompts!

But then I broke my own rules. Because another book caught my eye. And then I bought it. It's the Writer's Guide to Character Traits, by Dr. Linda Edelstein.

This book is sort of a Psych 101, while keeping in mind writers creating characters. There are lists, explanations, sections on childhood to sexuality. It's written by someone who has been in psychology since the early 1970s and who arguably knows what she's talking about. I don't know how it's meant to be used, but I intend to browse through it, letting my ideas spark, letting characters speak up when something speaks true. And also I plan to put my previous characters to the test, to see if they're as realistic as I hope. Because like all human beings, most of my characters have enough "traits" to worry their mothers.
And now I'm not allowed to buy any more writing books. At least until next year.

So what's enough? Unfortunately no one seems to have a final formula for how much attention each word deserves before you let it go. And you can easily get mired in agonizing over syllables. A common situation in any re-write: adding a word you think sounds good, removing it, and adding it again, only to have your first reader circle it and write, "Unnecessary?" in the margin. Yes. It fascinates me how easy it is for other people to pick out the words I've carelessly strewn throughout, as if those words have little neon signs on them saying, "Danger, editing shrapnel."