Each one took us an hour or so, but once we figured out the designs, the most time was for taking off the paper and gluing on the crayons. Taping the heart shape could (and should, if you do it correctly) take a little bit of time.
Forgetting the coupon for Michael's when we bought the canvases.
Buying Dollar Store crayons instead of Crayola, then having to purchase Crayolas. Dollar Store crayons DO NOT MELT!
Splatter from crayon melts - be sure to do this outside and have something to "catch" the melting.
Don't glue the crayon - put hot glue on the canvas first.
What made it easier:
Planning ahead of time.
Learning from my nephew that it doesn't have to be perfect!
Knowing you can always go back and change it - melt more if you'd like!
If you want to see the entire process and my entire reflection, check out this blog post.