Just did this Saturday. A few things:
1. I had some trouble pressing the bushing all the way onto the arm, so I hooked an 8 inch C clamp into the first web on the control arm, put an old brake pad on the face of the bushing, put the screw part of the clamp on the brake pad and torqued it down. It pushed the bushing easily onto the arm.
2. Pray that you don't have a seized ball joint. The outer ball joint on the passenger side took several hours to get off. Not fun. It would have been nice to have an air hammer with a pickle fork attachment.