The tutorial was remarkably easy to follow, and the result is fabulous. I've devoured four of these doozies so far tonight.
I read somewhere in the comments attached to the tutorial that chocolate adheres better to cornstarch than to confectioner's sugar, so I used the former to dust the marshmallows. Very pleased with the result and delighted to package them in Martha and Amy Butler packaging goodies received for Christmas. Ready to deliver to our Valentines tomorrow!