the way I do it is lock the steering on full lock for the end you want to replace, jack up under the wish bone and remove the wheel, undo the nut securing the taper, and using a ball joint splitter, crack the joint, do not move the hub at all and unscrew the ball joint from the shaft, it may well be very tight/corroded, you may need heat, fit the new ball joint and screw it in progressively until it drops straight into the steering arm on the hub without it moving the hub, if the hub has moved during this operation then you will have to get it tracked, do the same for the other side, you could still be a little out on your tracking as it is not a perfect method but at least the adjustments will be small if you need to get it tracked, the number of turns assumes that all manufacturers make the threaded section exactly the same length, some hope, Rick