From Ground: Water the evergreen sumac plant thoroughly to dampen the soil. This makes digging and handling the plant easier and reduces stress for the plant. Use a spade or shovel and dig around the plant, trying to get as much of the plant's root system as possible. The aim is to remove the root ball from the ground intact to reduce damage to the roots.
From Pot: Water the plant thoroughly, then carefully tip the pot on its side and gently tap the rim on a hard surface. This should help you loosen the evergreen sumac plant and it should slide out with the soil and roots intact. If the roots are tightly bound (root bound), gently tease them apart with your fingers or a fork.
From Seedling Tray: Gently tempt the evergreen sumac plant from its cell by pushing the bottom up rather than pulling it out by the stem which can damage the young plant. Tease the seedling roots if they are matted or overly tangled.