First, an ideal location must be found. It must be large enough to give the trees adequate space to grow (at least 5 feet between trees, but varies). It also must be in a location with good soil and water supply.
Third, mark out rows with posts to ensure that there is around seven feet in between each tree. This way, the trees will never have to be moved and will have enough water and nutrients. This also allows you to fit a lawnmower in-between the rows to keep the land looking well maintained.
Then it is most efficient to dig 5-10 holes at a time. For small trees especially, digging a hole takes only around 15 seconds. For our saplings, the holes are about 8 inches deep.
Finally, place a small tree in the hole, surrounding it with soft and moist soil. Make sure all the mud that was taken out of the hole is covering the base of the tree and packed tight. This provides support and holds sufficient water near the roots.