sup guys

i have koni yellows, but one of my rear is sitting on the lower perch while the other one is on the higher one .. this imbalance is pisisng me off cuz my right side rides higher .. i was wondering if its hard to change the perch clip ? after i take of the spring, what do i have to do ? would it cost a lot for me to go to a shop to get it done ? help mee plz