Need to dig out about 16 cubic yards of dirt and then put it back. I am not a construction person so I'm not sure how best to do this. It's level ground, no landscaping, no plants/rocks/gravel, just desert dirt, and no objects to dig around. It's not compacted as I can dig down at least a foot with a shovel fairly easily but it's too big a job for a shovel. Do I... rent a mini excavator? Hire someone (who)? I will call the city before digging. What else do I need to know?