This topic freaks me out too much to read a book on it, which is a bad thing, I know.
Take the Holy Spirit with you. You need to know your enemy. Fear is a tool of the devil, anyway.
Get a Miraculous Medal if you don’t have one, have it blessed by a priest, and wear it, and you may no longer be afraid. Just a suggestion, I’m not saying it’s a magical talisman, but your faith in it and the reminder to say the prayer is what’s effective. The famous exorcist Fr. Amorth says he has heard the devil utter a thousand blasphemies against God, but he cowers at the mention of Mary!
“O, Mary, conceived without sin, pray for us who have recourse to thee.”