There are several methods to divide a Christmas cactus, depending on the size of the plant. The most common way is to cut the stems with a sharp, sterile knife and then plant them in separate pots. Another option is to remove a leaf from the stem and insert it into the soil to form a new plant. Both methods work well, but it's important to wait until the plant has had time to establish itself before dividing it. Be sure to provide the new plants with plenty of light and water, and fertilize them regularly to ensure their growth.