Go for at least four feet at the deep end. I wish I could have. I wanted to but underground utilities and a shallow water table prevented it. Bonnie has her little Kubota and has done wonders with it. I would hire someone in a heartbeat. Oh, and if you do remember to leave a ledge around (unless digging in sandy soil) so you can have a ledge for pots of plants, unless you have critters which I guess down there is a problem so straight vertical sides are a must.
