Question about becoming installer!

Hi guys! I am seriously looking into going to school to become a professional car audio installer. http://www.metro-auto.com/ this is the school I may be attending. I would just like to know some useful info to help out, is it a good profitable industry to get into, and if anyone went to a school also, did they teach everything thats u needed to know to open your own place??
Any info would be greatly appreciated!

installing is technical ....... running a business is - business. If you like installing, you might wanna find someone to do the "books" for you, cuz once you start being the boss you won't have too much time to do install stuff.