Ball joints aren't too hard to do. I changed a lower (front) ball joint on my 88 coupe. On 88's, the ball joints are pressed in, so I had to take off the control arm, take it somewhere to have the old one pressed out and the new one pressed in. Then I re-installed the arm. I used a Rodney Dickman ball joint. His 88 version has a snap ring to hold it in place in case the press fit doesn't hold.
I'm thinking of getting a bench press from Harbor Freight, so if I have to do another, I can do the pressing myself.