Althought many of us will work hot at various voltages for various reasons, we should never minimize the risks of 120 volt work. It is foolish to say, as is often heard "it's only 120 volts". So many factors affect the resistance of the body path (dampness, contact area, overall health, etc) that it is easy to have a low enough body resistance to allow the one tenth of an amp that will kill most people, pass through the body. We don't know our resistance at any given time, and if we choose to work hot(even at 120), for whatever reason, do it cautiously.
