The factory manual shows pressing them out with a "special tool". The "tool" looks like a c clamp on steroids. Looks like a vise and a fat socket or pipe would do the trick, both in and out, and there's a snap ring to hold it in after you press it. Mark the arm at the mating mark on the old ball joint (center of the a arm), and align the new joint's mark with your mark.

Not responsible for advice not taken...