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For some reason its the first thing that comes into ones mind when trying to AP. But fear is nothing but a barrier, that is without need.

Angels will protect you, but only if you ask. Because we have free will, they can't do anything on their own.

I did an informal survey of OBE internet reports a couple of years ago.  I found that out of over 4,300 OBE reports only 180 OBE reports (4.1%) included a violent or dangerous encounter with a spirit/discarnate while out of body.
I therefore concluded that there is a minimal chance of danger during an OBE (I have had 3 or 4 vilolent encounters when OOB btw). It is possible yet unlikely (an acceptable risk).

Also I have yet to read a credible report of anybody being possessed while they were  having an OBE. Maybe this is possible (I don't entirely dismiss it out of hand) but I have just never read an account of it happening.

Grey

That's exactly it, majority of people do not have attacks happen to them. Even then, it only takes a simply call to an Archangel, and they will help you out.

Physically, you can be killed. I've heard that if you are startled awake, that you could have a heart attack or something.. And it's always possible that you could be posessed but it is very very very very very very unlikely. My friend had demons attacking him and such, everytime he left (don't let this scare you, since it is not common AT ALL) and not one posessed his body.

Don't be afraid of the what bad could happen
LET GO of the fear, and trust in your guides, and angels to watch over you.