I received the air springs today at 3:00pm and it took about 2hrs in the drive way for my son and I to install, all went well . Most of the time was spent making sure I had all the safety jacks and hydraulic jacks in place.We completed one at a time. We removed the feedback sensors arms to fool the computer system causing the Land Rover to lower. Re-inflatted the spring once one was installed and moved to the other side repeating the process. The instruction sheet was helpfull,and the only thing I had to replace is the top two retaining clips.