True, a genuine pro could do it freehand. Reminds me of the pinstripers at Jaguar back in the day. They'd go out for "lunch" (anywhere between 6 and 10 pints of beer) then come back and get right back on with it - totally flawless coachlines in spite of being barely able to walk in a straight line. That was just how it was back then and no one thought it the least unusual, dangerous or undesirable.
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Leave first - THEN negotiate!
Leave first - THEN negotiate!