Swapping out the suspension is easy. Get a friend, should take you a few hours. It's not hard at all. Its just unbolt, compress spring, remove top mount, compress new spring, put on top mount, and put back into car. Once you do one corner, you'll get the hang of it and be able to bang the others out. And as for leaving out a bolt or something, theres only 4 or 3 nuts, depending on front or rear, you shouldn't forget anything, its a cake job.