talking to yourself isn't so bad, it's confusing yourself that's the problem.
I was working in Kalamazoo a while back, and there were two guys doing countertops, they were kinda strange when they showed up in the mornings, and because of the adhesives they used they got worse as the day progressed.
A few times I'd be in a room taking measurements, or hanging trim/baseboard, and I'd hear someone come in talking :
"no, don't put it there it'll make a mess, spray the island, then the sink base next , OK, line that edge up and set it down easy, NO don't let it touch yet, yeah now press it into place"
Then I'd finish whatever I was doing, turn around and there'd only be one of those guys in the room, after the first couple times I'd try to keep WAY ahead of them.
ken.