How old is your car? Mine had abour 99k on it when I put on my springs/shocks, and my rear lower control arm bolts had fused to the bushings. I was able to do the front reasonably easy, but I had to take the car to a shop to break out the rear bolts for me. $100 dollars worth of labor and $50 worth of bushings and bolts (from the dealer) later, I changed out the rears shocks and springs myself.