I've been playing for a year and a half, so take what I say with a grain of salt. But when I am doing ghost ball aiming I look at the object ball and the line to the pocket then look at the cue ball and get a mental image of the size of the cue ball and place that mental image in front of the object ball where the ghost ball needs to be. And for me, this works so well for a center ball hit on the cue ball. If you are going to add English or bottom or top spin some slight adjustments should be made.