Mr. Bugs--

"Only people with strong knowledge...etc..?" Come on!!..this business is rife with folks who Lack knowledge..but are strong closers. I am continually having to correct audio problems in particular, because some 'expert' installed something the 'right' way...or specified inadequate equipment..

If someone is knowledgeable, willing to continually learn, willing to say "I don't know that answer, but I'll find out", willing to listen to customers' needs, does excellent installation work, cleans up after themselves, perhaps takes some industry standard training...Those folks stand a better chance.