Did a 14 and jumped off at the top (with a bomber nut) in the first few days and it was friggin awesome. I recommend no top-rope if they can... theyre going to have to face it sooner or later and with the top-rope I feel the reality is taken away from it... For me at least (and I admit, everyones different) I believe you want to put in PROPERLY good gear in a solid effort, if your ass is literally on the line.
Of course with that comes the caveat that they should practice and be checked in a variety of placements before they even leave the ground so ensure they have the idea right...
I dont know, I guess Im still bumbly but I really liked the way I did it and the fact I didnt use top-rope and so on. Seems the way to go for me?