The latter. Get to the height for the doorway and chock and cut the log below. Need all the logs suported at the doorway cut before sawing down. Otherwise it will bind (and of course the logs will be without connection to anything at the cut). With a chainsaw we can cheat a little and do a plunge cut, but I don't see any advantage to that. We might have to if I can't get a decision on where to place the door by the time we get to 6'.