ti chuot, i did my springs myself too, and i did them for several other ppl on this site too. if you have the tools, go for it, if ur mechanically inclined, you can't mess up...hahaha it's like screwing in a light bulb, it only goes in one way...
you don't need many tools, here's the list of wat i use:
jack stands (for safety)
spring compressor(the real one you mount on a wall) or kragen has the mini ones that also work
socket wrench w/ 19mm, 17mm, 15mm(i think, there are more too)
impact gun and air compressor(most ppl don't have it)
and a good brain
and viola!! ur done
some of the walkthrough's online are pretty helpful, but just don't show enough pictures.
oh yea btw, if you have no way of getting a spring compressor, don't do it. i've heard that when the spring shoots out it can go through 2 ft of concrete...well have fun