[superchad]

Never make a business of your hobby, in my younger days I wanted to get into Hi-End Audio sale and service but didnt want to loose the fun. Are you talking about sales? *Huge pain in the and can be make you bitter quick dealing with tire kickers and the stupid customers over and over and over.
Are you talking about install? *Hard to make even a living wage being a hook-up guy, very feast or famine career choice with few benefits and many potential lay-offs and probably not as much fun as you think, hooking up gear and giving advise to friends and family is fun, dealing with folks who look down at you and have paid you money is another story all together.........your not much different then the Landscaper.
Goin into business yourself? *far too many beat you to it and they are always a bad month or two away from folding plus it takes years of experience and alot of cash you should be prepared to loose, not to mention the Internet has changed the rules for everyone and most all Brick and Mortar stores struggle.
All in all I just dont think you are going to enjoy this as much as you think you will but hey what do any of us know? Dont let anybody tell you that you cant do something you really want to do, if you fail atleast you have tried! No matter what you end up doing I wish you all the luck in the world