Caveat: Have no experience on PVC.
I don't recall seeing that the procedure is all that different; just the materials used. Different solvent (usually), different glue, different patch material. Everything else remains the same: Clean, sand, clean, glue, dry, glue, dry, glue, nearly-dry, and join with as much pressure as you can get on it.
Personally, though, I'd say the repair the OP faces is a send-to-a-professional type job.