I didn't use a spring compressor. I started too, but after cranking it all the way down the OEM springs still wouldn't come out. So I disconnected the lower control arm, pushed it down with my foot and the old spring came right out. I used a bottle jack and floor jack combo to get the new spring compressed and the control arm bolted back up. It was a challenge on the left side, but after I figured out the control arm secret the hardest part of the right side was breaking the bolts free. I took me almost 5 hours on the left and 45 minutes on the right. I am not looking forward to the front.