I go from CCB to the top of the CB and extend the line until it contacts the OB. If I can't visualize a point of aim on the OB, I'll extend the line until it hits the cushion (fuzz ball) or relative diamond position. I've used the 'point on the wall' method, chalk smudge on table/cushion, or chalk position. (no cheating)
When I first started I concentrated on hitting CCB on the line I got after my pivot. I would only extend the line a few diamonds down table. Because of my random alignment (unsquare) my line would seem to hit the OB in the wrong place sometimes. On those shots my sneaky subconscious would kick in on the final stroke, my stroke would be jerky and off line, and I'd butcher the shot. I found by shorting my sight picture and not looking at the OB my success rate increased. After I got comfortable with the 15 perception I moved on to the 30.
It was only after I got my stroke and body position problems solved that I was comfortable looking at the OB for all types of visuals. I still use 'blind shots' as part of my practice routine. I consider my technique flawed if I can't hit a 2 diamond shot with 2 diamonds separation without peeking at the OB, using only the line after the pivot.
