Like RK said slow and easy until you get it all dug up, each pass will go a little deeper, and then just let the old gal eat, you will find stuff you didn't know was there,, First time I did my big garden I found a lot of flint chips and shards, seem the area was once covered with Indian villages high on a ridge and close to a good water source. Even found a couple unfinished projectile points, SO walk through the dirt and look close you might be surprised