Or simply visualize a big red circle with a line through it over their face, and fade the image to gray in your mind. Then make yourself busy or distract yourself with other things until the thought passes. I still get letters from people who continue to hold onto their fear. Any unpleasant psychic experience has more power over you if you fear it. This book was written by an author with a solid understanding of metaphysical principals.
Negative beings thrive on panic.
The more you flail about, the stronger they seem to get. When you stop running, they lose interest. You can't stop yourself from reacting fearfully at times. Some psychic experiences are disturbing and unpleasant. But holding onto your fear will not protect you from harm - it actually makes you more vulnerable.