I took a class in college on it as part of my course work. So after the murders when I was terrified all the time, I got out my text book and was able to design a strategy, a series of step to take to get over the fear a little at a time. The book is still available, as it turns out.
The book is called
Self-Directed Behavior: Self-Modification for Personal Adjustment by David L. Watson and Roland Tharp. The one I have is 1972. I looked it up. I found it on Amazon at
https://www.amazon.com/Self-Directed-Behavior-Self-Modification-Personal-Adjustment/dp/1285077091
And at
https://books.google.com/books/about/Self_Directed_Behavior_Self_Modification.html?id=uYEWAAAAQBAJ
This is what the write up says:
Achieve your life goals with SELF-DIRECTED BEHAVIOR! Featuring numerous research-based strategies, this psychology book guides you through exercises for developing skills in self-analysis and teaches you how to apply these skills in different settings. Case examples demonstrate how others have successfully used the book's techniques, including one individual who used shaping to gradually increase her ability to study, and another who learned to be more sure of himself on dates by consciously modeling a friend's confident behavior.
By using this guide, I got over it. Once in a while the fear would sneak back in, but I got rid of it again. I wouldn't be nearly as okay now if I hadn't done this. Let me know if you have difficulty finding it.