1. Jack up the car, and put on jack stands
2. Pull out the cotter pin
3. Loosen castle nut, and leave it halfway threaded on. This is to keep the lower arm from popping down uncontrolled.
4. After you loosen the castle nut the tapered bolt might pop on its own from the pressure from the spring, or you might have to hit the spindle with a large hammer on the area around the taper bolt.
5. After it pops loose, take the castle nut off. Watch out, the arm will spring down some.
6. Remove the 3 bolts holding the ball joint on.
7. Attach new ball joint to the lower arm.
8. Jack lower arm up while putting tapered bolt into the spindle. Jack it up until you have it all the way in.
9. Reinstall castle nut, torquing to 92 ft*lbs. If the hole for the cotter pin does not line up, tighten some more until it does.
10. Install new cotter pin.
Lower jack, you are done.