Then I dipped the tips of the stems in some inexpensive rooting hormone, and stuck the cuttings in the ground. I'm giving the succulent cuttings a good watering once every morning. So far everything looks good. I'll give you an update in a month or two.
Note: I have successfully propagated some succulents like jade and christmas cactus by skipping the rooting hormone and just sticking the cuttings in the ground. I chose to use the rooting hormone with the black aeoniums because I'm not sure how hardy black aeoniums are.