Me and my gf are building a 10x12 shed. It needs 9 12 inch piers dug 48 inches into the ground. I have a Harbor Freight 8 inch auger and a digging bar. Ive worked for a landscaping company before so im no stranger to digging. Am I insane to assume that itd be relatively easy to dig these holes? Id drill out the holes with the 8 inch auger, then knock the sides down into the hole, and then remove the loose dirt with a post hols digger. Let me know if im not thinking about this correctly. Other option would be to rent a 16 inch towable auger and dig the holes with that. #diy source