I wondered aloud if there are such things as "tattoo colleges" that like barber colleges--you can get a haircut at a big discount, but it might not be perfect.
This brought to mind a larger idea I have been having about physical skill and talent. Take something like surgery or dentistry; these people spend years training for their job and they must have at least a reasonable ability in order to graduate. All of the selective pressures leading up to the point where they actually use their hands are academic, but what really matters in the end is their manual abilities. If they don't have much manual ability, they have so much sunk time and expense that they pretty much have to stick to a profession they aren't much good at.