Customers: develop your systems. My quote system lays out our terms so there is no grey area. Everybody is aware of how this is going to work. Does it eradicate all "messers"? Of course not. It really does help though.
Employees: I've been told time and time again: don't work with friends or family. I've done both for two decades. No idea how I make it work, I think I'm firm but fair, others might disagree.