Related:

• Do you know that doing your best is not good enough?
  First you must know what to do. -- manufacturing-quality theorist W. Edwards Deming...
• When you do not know what you are doing, do it neatly.
• If at first you don't succeed, you're doing about average.
• If at first you don't succeed, you're doing about average. -- Leonard Levinso
• If you seem to know what you are doing, you'll be given more to do.
• When you don't know what you are doing, do it neatly.