Anyone that teaches the ghost ball aiming, better add that that's not all there is to it. On most cut shots you have to adjust for the same things you do with any aiming system. Ghost ball gets you in the pocket or very close each shot... the adjusting/feel is up to you.
Over 65 years ago, my Father taught me to aim in about one minute. He was an old road player. He said, " Draw an imaginary ling through the OB to the center of the pocket. Where the line comes out the OB, that's where you try to hit with a straight stroke. You will figure out why your going left or right of the pocket after awhile. If you can't figure that part of the game out, maybe you should open up a whore house and run it by hand." Johnnyt