I sometimes think if I sit at my computer for too long, reading news of doom or gloom, or even threads about possible threats that may befall me (not just entities either)...that my whole being starts to zone out.
What a wonderful state to be in for anyone/thing who might like to sneak a drain off me whilst in that state.
So my first tip would be to spend a limited time at the PC. (anyone read my thread on that...c'mon...hands up ?! What are you all still doing here ?

Hang on a minute, what am
I still doing here??

. Oh well, we're here for some learning, right? And some love)
Hang on though... my current path seems to be more about empowerment rather than disempowerment. So, not knocking anyone's real experiences here, but if I am to be the conscious creator of my own reality. Then surely I've got to get past the ETs, and positive/negative entities to see that at the fountainhead of unity (See "What the Bleep") I'm bloomin' one with everything. Everything in existence. Erm.
Where was I? I mean we? Perhaps a shift in our consciousness and understanding may mean that we can know longer suffer attacks, because how can consciousness attack itself?
Well, I don't know... but my feeling is that we don't need to worry. About anything. Phew, I must be eating strange mushrooms. I can see how this is hard to reconcile if you are being attacked by negative entities. I know I've considered the option that I have been. But now I'm also considering the option that it's a state I'm putting myself in. Negative entitiy? Poof. You're gone.
I agree with Oxy though, I've never been into 'calling in' anything... I am a bit superstitious (see? I'm not
that evolved

) about meddling with things I don't properly understand. (never be totally happy with mantras for that reason if I'm honest). Or drawing pentagrams. (Is it just me, or does part of that look like a Star Trek badge?!).
Be sure if something large and greasy comes knocking at my door, I'll be grateful for the info... but I ain't going to start using one unless something does. No sense in making anyone uncomfortable I say, positive or negative....