Try a bit of void gazing. Block out all the light you possibly can and stare into the darkness. Closets, hallways, and windows make good targets for void gazing. Settle in and try to visualize some kind of monster rushing towards you out of the dark. Visualize a normal human face staring at you from right outside your window. Keep your eyes open and try to feel vulnerable. You should be able to give yourself goosebumps right away.
The mind has an easy time disregarding plesant fantasies, but void gaze as hard as you can until something comes at you and your body will react. You will reflexively move to protect yourself and get a big shot of adrenaline. The animal self that runs your subcomcious and edits your sensory input is a lot less skeptical where it comes to fear.
Try your summoning in utter darkness. I find it odd that Koetting never mentions this technique. It’s totally classic and works really well.
Also, Koetting is the occult version of Bruce Lee. He’s really good at this stuff and wants to teach it to everyone, but he is naturally talented on top of his years of work. Self confidence is key to success, but one does not simply read “Tao of Jeet Kun Do” and start beating up Shaolin monks.