Fill the empty hole with water and check the drainage. If it takes longer than 24 hours to drain, select another site. A tree will die if its roots are underwater for long periods of time.
Prune the tree sparingly and only if necessary. Remove only dead, broken and diseased branches and roots that are crushed and girdling, or growing around the main stem. Removing even a small portion of healthy canopy actually slows root growth and delays establishment. A thoughtfully selected tree shouldn’t need to be pruned.