Any suggestions on where to learn to service your own regs? Or a reliable source for parts kits? Between the wife and I, we have several brands from Posiedon, Apeks, Scuba Pro, and so on of regs and I have no interest in spending $600 - $1000 in service. The local shops seem to charge $200+ per reg set for service.
All the references others have listed are good. I would add that you can go to EBAY and find an old regulator similar in design to what you have and practice. You can usually find a decent reg cheap enough to play around with and still have a good piece of equipment when you're done. Experience is the best teacher, the rest is just reading manuals.