If you have zero budget, search YouTube for "Psycho-Cybernetics Audio 1960" and listen to the first chapter on the "Theatre of the Mind."
Just do not buy the paperback. With a book this technical, you need the author's voice (or a narrator's voice) in your ear to truly "sculpt" your self-image.
Here is how to get it, and why listening will change the way you think. Let's address the elephant in the room.