Prepare the new pot by placing a 1-inch layer of gravel in the bottom for drainage. Add enough orchid potting mixture to the bottom of the pot to ensure the plant will remain at the same height in the new pot as in the old one.
Remove the orchid from its current pot by gently tipping the pot and grasping the plant by the base. Wiggle the plant out gently to avoid damaging it. Inspect the roots for rot. Remove any damaged roots using bypass pruners.
Place the plant and root ball into the center of the new pot. Fill around the root ball with new orchid potting mix until the plant is held snugly in place. Water the re-potted plant thoroughly.