You should know what you want to do, of course, but you are not usually the client unless you're a hobbyist (or a fine-art type, who is essentially a hobbyist w

You should know what you want to do, of course, but you are not usually the client unless you're a hobbyist (or a fine-art type, who is essentially a hobbyist who takes money in applause). Non-destructive editing is not optional. (A photographic file might typically have several tens of layers, and that's at the low end of the scale. Hundreds is not uncommon.)