Here's how I always do it (probably mine you read before). Loosen the castle nut but don't remove it. Put a jack under the rotor and lift it an inch or so the weight of the car is on the suspension and not the jack stand. Take a good sized hammer and smack the LCA on the side of the ball joint (be careful to hit just the LCA and not the boot or castle nut, but take good sized swings). The LCA is cast so your not going to damage it and your not actually hitting the ball joint itself so it won't be damaged either. A little WD-40 never hurt nothing, so it's not a bad idea but I've never needed it but it does take a good few whacks sometimes though. Good luck.