[Gagstr]

Do copper in a qt with the fish that have ich the worst. Get yourself a UV sterilizer if you don’t have one, it will help your fish fight off the ich. at the same time you are running a coppered up QT I would run a hypo DT just to get rid of as much ich as I can. However do not combine both techniques with the same display, it is too stressful for the inhabitants. When you run copper on the QT make sure its Chelated Copper (excuse my spelling please) and monitor it often to make sure you have the right concentration of copper in there. Constant monitoring is also required for the hypo tank. Read the sticky's it will teach you how to beat ich. As for abandoning your LFS, I wouldn’t, just make sure you QT everything very carefully! I also started in this hobby not to long ago battling ich, 0 casualties  I won!! Good luck!
p.s. Treatment for tanks that contain corals, inverts, and other delicate organisms will be different! Make sure you take that into consideration.