Ball joints are a common cause of problems in the suspension and steering systems of new vehicles. They can be easy to replace if they need to be or else they can be difficult to replace if they are riveted or pressed into place. If you have ones that are simply bolted in place or threaded in take a look at this Ball Joint Replacement and Inspection. That article will tell you how to properly diagnose and replace bolted on or threaded in ball joints.
OTC-6530 Ball Joint Master Kit