When I was still a resident of a big city, I found it invaluable for times when I needed an extra dose of protection, as well as times when I simply preferred not to be looked at (i.e. creepy stare moments).
Plus, it’s really simple! All you do is visualize a huge, mirrored sphere around yourself, instantly reflecting any and all energies pointed your way right back to where they came from. This way, if a person is directing envy, unwelcome lust, or any other undesired thought form your way, it will bounce right off you and go back to its source. And, if someone is leering at you or simply making you uncomfortable or self-conscious, they will no longer see you, but will rather see some form of his or her own reflection. On really sunny days, they might also be sort of energetically blinded, causing them to avert their eyes.
It’s basically an instant protection ritual!
(This is an adapted excerpt from the Your Invisible Magical Toolbox chapter of my book, Holistic Energy Magic.)