The joints are cheap so it's all a matter of labor in your area-about 2 hrs but they almost never need replaced. If you are handy it's easy to do yourself.
When replacing parts of a car, it is important to know the general cost of the fixes. To replace the ball joints for a 2003 F150 pickup truck, it is going to cost a person $40-$60 to do it on their own.
Replacing Ball joints Check Related Links Below
Replace U-joints.
go to following link you will get the answer: http://www.wonderhowto.com/how-to-replace-brakes-2003-f150/
you will probably need a ball joint press and a splitter
there is none.....everything should be sealed and greaseless on a stock setup
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