ball joints

Hi, i need to replace my lower ball joints and arm. I was at Sears and they want over $600. to do it. I'm think of doing it myself. the parts are much cheaper if i buy them. Has anyone done this themself? I don't want to get into it if it requires specialty tools, or a real pain to do. please...

Up for sale is a pair of SPC adjustable ball joints purchased a few months ago for my 2007 Mazdaspeed6. I never got around to installing them and am now having to sell the car due to finances and family situations (having a 2nd kid). The ball joints are NIB, never installed, never even out of...