When you believe in yourself, you'll trust your wisdom and your strength. You'll trust your perceptions and you'll believe you have the right to your emotional and physical well-being. You're much more likely to do what you need to protect yourself.
When I first wrote this, I wrote just "understand reality". Then it occurred to me, almost like a blinding flash, that many folks understand reality, but don't really face it full on. Completely see and accept reality and you'll be miles closer to being safe and being in charge of your life.
We might almost say "Stay awake." We're all often daydreaming, I think. Stay aware, wherever you are, whatever you are doing. This is really just the same as the idea of "being present" - leading not only to being safer, but potentially to greater enjoyment of the moment by moment experience of being alive.
I now always say in classes, "If you ignore or forget everything else I say today, remember this one thing... If your intuition is warning you, there IS something wrong. Trust it, and act to increase your safety." That's how strongly I believe in the importance of intuition. (Anyone who hasn't read Gavin de Becker's book "The Gift of Fear" on this really should.)
Looking strong and confident makes you MUCH less likely to be targeted.
One woman, after doing our weekend Intensive, ended literally years of office harassment with a couple of sentences. I don't remember exactly the words she told us but it was something along the lines of, "That is degrading and offensive. It's harassment. I don't like it and no woman does. You - will - never - speak - to - me - like - that - again." (All spoken with 100% congruence and the eyes of cold fire.) We have heard so many times that a just a few words was all that was necessary to end a situation, be it harassment or potential attack.