Here's how I do it:
Look in the direction you want to go...let's say right.
Lightly step into the right stirrup....
Apply left rein to the horses neck....while opening right rein up...(open the door)
Apply outside leg.....horse moves one step.....release and reward......
Same goes for other rein......
However, neck reining is one skill....but you should ride cues in this order:
Look
Seat
Leg......and then
Rein.....
That's how reiners look like they're just sitting there doing nothing! Sadly for me, I always look like I'm doing something!!!!
What bit you use, does not matter.....it's getting the horse to respond to the rein through other cues.......but you want to use the other cues FIRST.....it's really awesome when you just look where you want to go and the horse takes you there....
If you need to bump him lightly if he doesn't respond to your leg cue, that is ok too, just like Sorrel Horse said