You can rent the tool from Performance Products and you DO need it to press the new ball joints in. Replace the lower ball joint and the upper control arm (ball joint is built into the upper). I would recommend taking the spindles and new ball joints to your local independent and pay him/her the $100 to remove the old ones and press in the new ones. You can purchase the parts here. I would also recommend getting new tie rod ends and replacing them while you are in there. Don't know how safe it was but I used the tie rod end separator to break loose the ball joints. It worked.