My home was built in the late 60's. Like many homes built then, the plumbing is cast iron and is now developing cracks. I haven't lived in JC long, this is my first home, and this is the first real home repair that is needed. I know it needs to be converted to PVC. I don't even begin to know who to call, and don't want to get taken because I don't know plumbing. Any recommendations? Looking for someone with references and some sort of guarantee on their work.