Much of what has already been written covers what I would have said, too. If I could add a discovery that might be helpful to someone, it is about trust.
It takes a kind of innocence to let go of thinking anymore, and just allow the body (breathing process) to become so prominent that it is just about all that's left in awareness. In my experience, at a certain stage I need to give my trust over to this body and this breath
, that it will keep going with or without my active participation, and thus I don't have to interfere so much, just let it be and do it's thing. All 'I' need to do is to observe.