People like ourselves may see nothing wondrous in writing, but our anthropologists know how strange and magical it appears to a purely oral people—a conversation with no one and yet with everyone. What could be stranger than the silence one encounters when addressing a question to a text? What could be more metaphysically puzzling than addressing an unseen audience, as every writer of books must do? And correcting oneself because one knows that an unknown reader will disapprove or misunderstand?
You don't always have to go so far as to murder your darlings—those turns of phrase or images of which you felt extra proud when they appeared on the page – but go back and look at them with a very beady eye. Almost always it turns out that they'd be better dead. (Not every little twinge of satisfaction is suspect—it's the ones which amount to a sort of smug glee you must watch out for.)
I talk about the things people have always talked about in stories: pain, hate, truth, courage, destiny, friendship, responsibility, growing old, growing up, falling in love, all of these things. What I try to write about are the darkest things in the soul, the mortal dreads. I try to go into those places in me that contain the cauldrous. I want to dip up the fire, and I want to put it on paper. The closer I get to the burning core of my being, the things which are most painful to me, the better is my work.
You know that sickening feeling of inadequacy and over-exposure you feel when you look upon your own empurpled prose? Relax into the awareness that this ghastly sensation will never, ever leave you, no matter how successful and publicly lauded you become. It is intrinsic to the real business of writing and should be cherished.
I think that to write well and convincingly, one must be somewhat poisoned by emotion. Dislike, displeasure, resentment, fault-finding, imagination, passionate remonstrance, a sense of injustice—they all make fine fuel.
You most likely need a thesaurus, a rudimentary grammar book, and a grip on reality. This latter means: there's no free lunch. Writing is work. It's also gambling. You don't get a pension plan. Other people can help you a bit, but essentially you're on your own. Nobody is making you do this: you chose it, so don't whine.