I can only speak about my own pdoc. I have always felt pretty confident that he has a plan in mind, probably because he tells me what his plan is, why he is making the decisions he is making, what his plan B is if this doesn't quite work as he believes it will. And when he's guessing, he tells me that too because there have absolutely been a few times when he was quite willing to admit what he was about to try was not his usual plan.