Hi Natalie.
You wrote,
Why can't it be that easy to leave my body every time?
Yes, ain't it the truth. I think that about says it all!
However, one way to overcome one's limited skills at being a regular OBEer is to take advantage of the opportunities when they Do arise. You seem to be good at that. It could well be that pre-projection states DO in fact happen much more often then we realize. (I believe that is true, anyway.) So just recognizing those moments and being mentally able and ready to induce an OBE might be more than half of the 'process' of going OOB.

Cheers
Grey