Ask first before having work done- get it in writing. Write on the ticket anything over that amount they must call first. Ask around who is good and who is not. We have several in our area we recommend and one we warn everyone not to go to. We thought ours was a uniquely bad experience with that shop but it turns out there are many who failed to even tell anyone else so this shop continued to rip people off. We made sure to report them to the beter business and to the local retailers board.