changing springs w/o a spring compressor is very dangerous. the spring is capable of shooting out and breaking through 2 feet of concrete.
unless you already know how to properly shoot out a spring, don't try it. have a shop do it for you for about 60-100 bux.
if you want to lower the car, and make it look aggressive but not too low, go w/ the hotchkis springs. it'll lower the car to the point there the Fenders
are just above the wheels.