I would like to know more too, but from my own experience with my clients they usually get very satisfied when you are as honest as you can be if you screw some

I would like to know more too, but from my own experience with my clients they usually get very satisfied when you are as honest as you can be if you screw something up, and make it up for them as a gratitude token. People still value humility in doing business, they just don't want to feel "cheated" even if you it wasn't your fault really. I was really surprised at that, I thought I was done when I made my first serious mistake but my clients were pure understanding and support.