I was foolish to think I could explain messy cleanup procedures AND finish this in one day. BUT--it worked out pretty well in the end and I absolutely LOVE the results.
This did take us two class periods.
I had a couple of students completely BAFFLED by the explanation. When I asked if they had ever cut out a paper snowflake, they were like NO. So I realized that might be a problem for some of my 5th and 6th graders.
But for the most part, we had a lot of success. Even if they cut their paper in half, or in 4 pieces accidentally cutting on the 'fold' most were able to make the stencil idea work.