That is how I do it too. I use both hands at first. Lay the neck rein on and the leg on the same side. Then follow then the direct rein. Later as they learn it, you have to use the direct rein less and less. When I take the rein off the neck is the signal to quit turning. Do not put the rein against the neck harder for a tight turn. Use your leg to move the horse over, not the rein. It needs to be a light touch on the neck or you will affect his head movement. So for a half circle the rein and leg stay on the horse until the half circle is done. Then take them off. For just a slight change, I just use the rein and leg for a brief time until I get the degree of turn I want.