its very easy to do yourself with basic tools and should only take about a half hour to an hour.all you have to do is unbolt the lwer part of the rear shock from the lower arm and it will drop .then just reach in and yank the old spring out and shove the new one in. much easier than doing the fronts. My rear lowering springs on...Only the rears, Im taking it to my mechanic so he can put my new tires on...And i want to have him put the rear springs on, I did the fronts easy, but dont wanna mess with the back...