if you're going to lower the car, don't forget about new shocks which can handle the lower, stiffer springs
AND... get thicker anti sway bars! When you lower the car the roll center o the car drops down as well, and you need stiffer/thincker anti sway bars to compensate.
also, I don't remember the procedure for replacing springs/shocks but it's not too diffucult, just a bit time consuming
