One mistake that I just witnessed from a friend's property was a mismanagement of the soil horizons as they are excavated. The A horizon soil should be kept separate from the B horizon, and the B horizon soil should always be placed underneath the A. This is a simple yet surprisingly common mistake. There is usually a change of color to indicate when you have hit the B horizon. Not sure what types of soils you are dealing with out there though.
Anyways, best of luck, please let us know how your projects pan out!
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