Hoss has hit the nail on the head!
My bad experience was showing up to cook a pig that the customer provided. I arrived to find that they had killed an old boar pig that they had been feeding garbage. It smelled so rank that I didn't think it was edible--they wanted it--I cooked it--it tasted terrible. There I stood by my by my well lettered BBQ pit--wishing that I could hide my name.
Next day one of my wife's co-workers tells her about this party she went to that the guy cooking the pig didn't know what he was doing, and the pig tasted horrible. My wife asked her the caterer's name and guess what?--it was Chuck Wagon BBQ Co
now--I supply the pig or I do not cook it---if the customer wants to supply the pig I tell them where to rent a BBQ pit. No one else will protect your reputation--you must protect it yourself.