The rear springs are actually easy to swap out. All you have to do is: Jack up the car (put it on stands!), remove the wheel, then take off the shock (Replacing it wouldn't be a bad idea since you've already got it out), disconnect the swaybar endlinks (upgrading to a bigger swaybar is easy at this point too), remove the two bolts at the bottom where the lower control arm connects to the hub, and then the control arm should be able to just drop down. Push it as far as it'll go with your foot, while yanking out on the spring. It should come out fairly easily. If you don't want much drop, go with the Vogtland springs. I just put them in my car and it only dropped it maybe an inch, if that. Plus, they're much stiffer than stock, so you probably have even less chance of bottoming out with them. Another plus is that lowering springs are easier to put back in.