If you are doing the work yourself, I suggest the following procedure:
1. Buy new lock nuts.
2. When you get the new half shaft, fit the hub and old nut, washer etc, to it and torque up (all off the car).
3. Mark or measure the distance of the inner hub face relative to the shaft.
4. Remove the nut again and measure the amount of thread protruding from the hub.
3. Replace the nut a few turns to protect the thread, then give it a whack in a vice to split the hub from the shaft taper.
You now know how far the new bearing should be pressed on, and be able to confirm it is fully home when the job is done.
I did not do this and had an expensive and frustrating year of hassle, all of my own doing
Paul