it's better to just replace the whole control arm, it's waist of money i think to buy the ball joints separate, one ball joint is almost as half of the whole control arm
. once you replace the whole arm you know you start with all ball joints new.
If you are replacing the bushings yourself it will take some patience and muscle, they are PITA sometimes. Once i take the control arm of the bushing i take my lolipop and new bushing to a press shop, it's a snap if you have a press machine.
Might be a good idea you upgrade to stronger bushings if you like and you can afford it, it will improve your handling.