Things You Will Need
But if your plans require an enlarged footer, a bell-shaped flare at the bottom of the hole, this is often more easily accomplished with a good pair of post-hole diggers.
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Dig your post hole to the depth required by your building plans. Consult with the building inspector in your area to determine your local frost line, as this in turn determines the depth of your footing. The footing must be below the frost line to minimize heave damage.
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Begin to flare your post hole when you have reached about half of your over-all required depth. This is not an exact science, but a simple a guideline. Flare by digging around the sides of the hole at a slight angle.
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Flare your footing as much as the opening of the hole will allow, making a gradual slope from the beginning of flare to the base of the post hole, and remove any excess dirt with a shovel.