@candyquilt-- I agree with you. Moreover, for this experiment to work, the heat of the lead needs to be just above the melting point. If it's higher than that, then the experiment might not work and might cause burns. Also, if there are any spots on the hand that are not wet, they will get burned.
An experienced adult who is very knowledgeable about science can probably do it to show the Leidenfrost effect safely. There have been a few TV science shows where they have done this experiment successfully. I personally would prefer showing one of those shows to kids rather than doing it myself.