So what exactly are you looking to do? At first you said you do not want to attempt pressing the ball joints out, and next said you are going to pick up ball joints and are asking how to press them out?
Most anywhere you look will only sell you the control arm with the ball joint already installed for anywhere from $50 to $150+. If you can find the ball joints alone, however, the tool spec'd out in the G6 shop manual is GM J-43631 - Ball Joint Remover which itself is about $150.
You can look up the tool online, essentially it is a small C-clamp tool designed to fit our ball joints. Good luck, let us know if it works out for you.