I do this fairly often with wild apples I find on the sides of rural roads and others on my property. In early August I'll go in with a sharp spade and dig around the tree creating a root ball, but I leave the tree in place. By doing this you severe the roots and this promotes a lot of new root growth within that root ball. Then in November I go back and simply remove the tree and place the ball on some burlap, tie it up, and move it to its new location. Watering is still a must in the fall to compact the soil and remove any air spaces. I have had very good luck doing it this way, moving even some very large trees. I get those with my backhoe…just pop them out and transport them quickly to the new hole.