Dig the hole with a post-hole digger and shovel. An 8-foot post needs to be 5 feet above the ground with a minimum of 30 inches deep in hard soil to 36 inches deep in soft soil.
The width of the hole needs to be twice the width of the post. So if you’ve got a 6-inch wide pole, you’ll need a 12-inch wide hole.
PRO-TIP: Hole diggers are known for causing painful blisters and calluses. Protect your hands with a pair of heavy-duty work gloves.