When replanting a Christmas cactus, it's important to provide it with the right conditions for it to thrive. Start by selecting a pot that's only slightly larger than the current one, and use a high-quality potting mix specifically designed for cacti and succulents. Make sure to use a pot with drainage holes at the bottom to prevent waterlogging. When repotting, gently remove the plant from its current pot and loosen the roots slightly before placing it in its new home. Water sparingly after replanting, and avoid direct sunlight until the plant has settled in.