You learned a valuable lesson my man, but you wouldn't have unless you tore it apart. It's all part of learning. Next time, you'll know what to do. I wouldn't worry about it too much. As far as the caliper goes, I wouldn't have them fix the old one, just get a reman one from an autoparts store. A1-Cardone makes a good rebuilt caliper. Sometimes it costs more to get the old one fixed than it would for a new one.

Congrats on your brake job!!! It's not hard, you just have to have the guts and the time to tear it apart. Before you know it, you'll be rebuilding engines.