How many miles are on the car? Are you changing them for rusted off sensor rings? If the miles are high or rusty rings you may want to get new lower control arms and bolts before starting the job. The bolts like to seize in the arm bushings and any application of enough heat to get the bolts out ruins the bushings. I'm talking about the short S shaped arms. Other than rusty, seizing bolts the job is a straight forward CV replacement like any other.