Yes, I had read that a piece of the stem is important if you want a plant to root. I plan to use a single-edge razor blade for the cuts (my knives aren't all that sharp) and, of course, will let them callous well before planting. Might not have a great success with this experiment - but I'll learn something in the process.
I'm debating about using root hormone; don't usually mess with it. Or I could try it both ways, with and without. Thanks for your advice. I'll post updates.