Gavin De Becker's The Gift of Fear is one of my favorite books. De Becker, a security expert, tells women to trust their instincts. Our instincts will tell us if a situation or person is dangerous. This has the dual benefit of warning us of danger but also freeing us from a generalized sense of fear, because we can trust that fear will kick in if there's danger.
My favorite line from the book is when he says (roughly), "Predators are animals. But you're an animal too."