Extra vices come in handy. My beginning vices are great for when I'm teaching the scouts that I have in my flyfishing merit badge. Also the first ones were so cheap that I don't have a problem letting them leave my possesion for a week or three so they can experiment on their own. What I do is make up a zip lock bag with materials for a fly of the same pattern and let them take it it with them. Let them be creative.