Read Becoming a Writer by Dorothea Brande. Then do what it says, including the tasks you think are impossible. You will particularly hate the advice to write first thing in the morning, but if you can manage it, it might well be the best thing you ever do for yourself. This book is about becoming a writer from the inside out. Many later advice manuals derive from it. You don't really need any others, though if you want to boost your confidence, "how to" books seldom do any harm. You can kick-start a whole book with some little writing exercise.
Hilary MantelWhen I came to write my Thomas Cromwell books, I moved onto the center ground of English history, but I was never there before. I didn't feel it was my history particularly, coming from Northern Britain, being of Irish extraction, being a cradle Catholic. The image of England I grew up with felt somewhere else. There was an official England in postcards, but it wasn't one I had visited. But I decided to march onto the center ground and occupy it whether it was mine or not.
Hilary MantelTo a Brit of my generation, one of the most objectionable things about [Margaret] Thatcher is her falsity. She is a total construct. For one thing, she had a made-over accent.
Hilary MantelHe once thought it himself, that he might die with grief: for his wife, his daughters, his sisters, his father and master the cardinal. But pulse, obdurate, keeps its rhythm. You think you cannot keep breathing, but your ribcage has other ideas, rising and falling, emitting sighs. You must thrive in spite of yourself; and so that you may do it, God takes out your heart of flesh, and gives you a heart of stone.
Hilary Mantel