All this demonism is nonsense.
This is how to not ever have to struggle with any type of demonistic occurrence.
Step one.
Get a good Bible, and read it. The more regularly the better.
Step two.
Find a good church that teaches what is written in the Bible.
Those two steps alone will do the trick, but if you really want to get good and educated, find some good church history resources, and read that material. And the writings of the folks mentioned in that history material. Like the letters that Justin Martyr wrote. etc...
Read the book of Concord, the confessions of faith, compare them to scripture.
You can get real sound in doctrine quick, and no demons can come near you then.
Man you will have all the words of faith, and all the words of the men of faith. You will be solid.