I am right handed; therefore, I normally held the torch in that hand except when I transferred it to use the hammer. When brazing it is the torch that needs controlling, more than the filler rod. The temperature of the metal is controlled by constantly moving the torch away if the metal gets too hot, and back again if it cools. The actual motion of the torch tip was in small circles, with an occasional flip away and back.

The goal should be to reach the melting temperature of the filler material, then maintain that temperature constantly until the joint is finished.