It’s bad business to buy a rootbound plant. In my case the plants in the atrium of the house we bought two years ago were in need of transplanting. I didn’t realize it until the leaves were turning yellow. Trouble would happen soon because rootbound plants are dehydrated. The soil is hard and water repellent.
I chose pots slightly bigger than the ball of the root and made sure the drains on the bottoms were open.
Doing one at a time, I padded the pot with fresh potting soil, trimmed yellowing leaves, placed the plant in its new pot, added more soil, and give it a good soaking.