That said, just put a pipe in your mouth and forget its there. You'll be breathsmoking naturally in no time. Just stop puffing, stop paying attention to it, and don't touch the pipe with your hand. You will naturally start breathsmoking without worrying over the subtle nuances.
When I was a kid, men just lit their pipes, and carried on doing what men do, stacking firewood, reading the paper, balancing the checkbook, etc... This was breathsmoking. No big plumes of smoke coming from them, just smoldering tobacco, in their clinch. No reason to overthink it. Just a slight trickle of smoke constantly circulating through their gullet.