Replacing Ball Joints... Help.

[gorgasm]

After some research ive come to the conclusion that my balljoints are bad in my 95... the suspention clunks around back and forth upon and sort of weight transfer, and driving the car is pretty scary.. I was wondering if anyone has changed these themselves before and how much work is involved... or how much I should expect to pay if i were to take it in rather then do it myself... how difficult is this to fix? Im going to take it into an alignment shop or something to confirm that its the ball joints.. any help is appreciated guys, thanks.