"The Caterpillar and Alice looked at each other for some time in silence: at last the Caterpillar took the hookah out of its mouth, and addressed her in a languid, sleepy voice.
`Who are you?' said the Caterpillar.
This was not an encouraging opening for a conversation. Alice replied, rather shyly, `I--I hardly know, sir, just at present-- at least I know who I WAS when I got up this morning, but I think I must have been changed several times since then.'"
Who are you? Easy question. Tricky answer.
Get to know your characters. Discover their histories. Uncover their ambitions and their dreams. Embrace their flaws. Some writers do this by writing mini-biographies, some do it by simply ploughing ahead and discovering as they go. Do what works for you - but the better you know your characters the truer they become.
Get to know yourself as a writer. This is all about self-trust. You can read every how-to book in the world, but only you know what works for you. Brush up your grammar? Certainly. Perfect your technique. But find your own style - it's there just waiting to be uncovered.
Who are you? That is the question. It's a question both for our characters and for ourselves. Find the answer and you find your voice.