We're heading perilously towards the "I think, therefore I am" theory. If one thinks one is 'out of body' is one really so? If one thinks one is 'in Paradise' is one really so? If I feel I'm posting this, is it true or all in my mind? Are we really here or is it all a figment of our imagination? The reply is of course that we cannot prove any of it. On that basis, we just have to act 'as if' and go from there.
By the way, my sis told me of several patients who watched their own operations from a position high above their own selves on the table. They said they'd floated up and watched the surgeon chopping and stitching. So, to test the next one that claimed this, they put a large rather rude nude picture flat on the top of one of the tall pieces of equipment in the operating room. Not one of the OBE's said anything about it, or could describe it. So it was all a hum!