Cinnamon is a natural fungicide, so it helps heal the open scar left on the stem or branch where you will remove the leaf. Choose a healthy looking leaf, then do a gentle twist and pull on the leaf, so it's easier to get the petiole intact. Don't add sand anymore, just make a new mix maybe do it 50-50 your cactus soil and perlite. That should keep the media open. Since the cutting has no roots yet, put plant in part shade, so it can redirect energy to forming the roots.
Just lay that leaf you pulled on top of the new media you got. Cut end will naturally dry out and in time it will make new roots or new leaves first. I would not want to water it now. Just allow cutting to recover. Once you see a new growth, water a little, around the plant but not too near the new plant, just to keep the soil moist..and then leave it alone again to continue growing. Just be patient in waiting.
The other jades with roots will be able to adapt faster, since there are roots already. Just have to keep that media airy and dry, you can water it thoroughly once at root zone level to keep the soil moist, and leave it alone. Next watering can be in another month, since it is indoors.The south west position is okay.
If temps begin to improve in your area, you can gradually bring them out, in a protected area where it will not get too rained on, but still get good light. Temperature range of 10C to 15C is okay, as long as they are kept dry and with bright light.
