The Kalanchoe (specifically the Marniers) is a good succulent for a beginner to try leaf propagation. All you need is a healthy Marniers Kalanchoe.
Just pick a healthy leaf off the plant, try to create a clean break by gently twisting the leaf. The specific leaf you decide to pull doesn’t matter too much. For aesthetic reasons, I personally pull try to pull the leaf from the lower stem. Once you pick it off just place it in a dry place where it can receive indirect light. If it receives full sun, you’ll have a chance of causing sunburn which will reduce your chances of propagation.
After about 5 – 14 days, you should start seeing small roots and/or tiny leafs forming along the edges of the original leaf that you picked. This is a good start, but we need to wait a little longer before watering to prevent the leaf from rotting. Once you have small plants with a small root system, you can transfer it to soil and start watering the new pups.
If the leaf starts to dry/die before the pups start to appear, the process may fail. It’s common to have a few failures (especially when you’re just starting). Just give it another try, and be sure to include the petiole (the small stem connected to the leaf). The propagation usually occurs from the petiole (the mariners kalanchoe is unique in the way the pups form, but the overall process is the same for other plant species).
As a side note, propagation works best during the growing season. So, for me I try to propagate in the spring/summer. I’ll sometimes continue to propagate into the early fall under a grow light, but it does take longer for the process to take place.
The entire process will take a month or two, but requires little effort from you (other than resisting the temptation to water before it’s ready).