The following are some of reasons for repotting plants. The best time to repot plants is when they are actively growing, usually spring through summer. Recently I noticed new growth on many of my houseplants. Now that we know when and why, it's time for how. Hopefully the plant isn't too big to lift and turn upside down.
Large plants take a little different technique and the help of a friend.
To get a plant out of the pot turn it upside down with one hand on the soil surface with the plant stem between your fingers. Put your other hand on the bottom of the pot. Now with a sharp downward motion support the plant and soil with one hand as you pull the pot off with the other hand. Most plants will require you to hit the edge of the upside down pot onto a hard surface such as a workbench. Once the plant is out of the pot, be sure to examine the roots.