actually you get a very big pair of channellocks. jack up the jeep and squeeze the ball joints. i have a 24 inch set of channellocks at work i use for tis purpose and many others.have one jaw on the top of the ball joint and the other on the part where the nut is. to remove them will be a pain if they been in there for a long time. spry them with pb blaster or aerokroil and let them set, repete for a day or 2 then have at it. you will have to remove the brakes,calipers rotors and axels to get the ball joint press in there to press them out. you still may need to add heat to the situation still to get them out.

Different vehicles have different ways of checking them yes some you shake the wheel from top to bottom,some you jack up one side as close to the ball join as you can with a floor jack and pry up and down and some you squeeze. my ball joints was very bad and the only way i knew about it after trying every method i knew was squeezing them. another thing don't get factory or cheap ball joints i reccomend moog and i am sure there are other good ones that these guys know about.