I support what the folks above have written. The most important thing about all of this scary stuff is to focus on non-scary stuff. I was thinking about the same thing recently so I posted a blog article about it... Answers to the Worlds Problems - Blogs
I'd say the first rule of scary demon stuff is avoid it. Especially if you steer clear of the supernatural, your chances of being hit with the demonic are worse than getting eaten by a shark in the local pool. Of the reports of demonic activity, how many have actually invited it by playing with oujia boards, and trying to communicate with the dead?
Like trying to start a fight in a seedy bar, if you go out looking for ghosts and demons, you're probably going to find em. But it may not be everything you hoped.
Near as I can tell, these li'l jerks (demons and negative entities and such) feed off of fear and anger. So the real trick is not to feed them. Focus on love, and hope, and all those things that rarely make the news cuz they're too pollyanna. If you REALLY crave the supernatural, why not read about angels, and unexplainable occurances of positive things?
You don't have to go supernatural to realize that if you expect or are focused on bad things happening, then they usually will. It's a self-fulfilling prophecy.
So, my best advice is this. Whenever you feel afraid of the supernatural, or the preternatural, if you're religious... pray. If you're not, then the solution is similar. Fill yourself with goodness. Fill yourself to the brim with all the hope and good times and love that you can muster. If these things are attacking from another realm, remember that you were born here and have amazing power in this realm that they have to steal energy from the living to employ. You are nearly infinitely more powerful than any spirit in this realm.
Most often these fearful thoughts are just that: thoughts in your head. Most often there is nothing supernatural about them, and by filling yourself with good, there's no room for fear. This is usually true even if the fear IS the result of something outside this realm. If there IS something bad out there, filling yourself with love is the best defense. Their strongest weapons are fear and anger, and if you're too busy loving the world to allow those into yourself, then the bad guys are out of luck.
Realize your authority in your life. Realize how much power your positive thoughts have over even real live people in your world let alone phantoms. If you go up to people all down and dejected, how do they respond vs. going to them uplifted and positive?
Religious rites, regardless of the source all have the same commonality. They establish your authority and will over the supernatural in your life. Realizing, accepting, and projecting that authority is the first (and probably last) step to eradicating any fear you may have.
From the heart, I offer my blessing of peace in your life at all times and in every way. So I'm just one person with as much right and power as any non-living thing to do the opposite. My li'l blessing alone should take out at least one if not all of those stupid li'l buggers. Whenever you feel afraid, remember me (if not the many people around you that love you and feel the same way), and accept it as a token against fear and negativity. I am a real person writing this message directly to you from my home. I'm Alive with blood and passion coursing through my veins. You are reading my words written out of my living desire for you to have peace and to have no fear. How much more powerful is that than an unnamed, uncertain fear?