First sit quietly, close your eyes and take several deep breaths. Recall a special moment when you felt absolutely at peace, perhaps you were listening to a favorite piece of music, or floating on a raft bobbing up and down on the water. Use all your senses to visualize that moment and hold it in your mind, lovingly noticing every detail. Keep coming back to the image if your mind wanders. After a minute or two, let it fade until the next time you need it.