I have a yard the needs sodding. The ground is very bare and hard as a rock. There are many roots barely showing from the huge trees all over the property. My question is what would you guys recommend for prep before laying sod? Should I bring in a dump load of field dirt and sand to level out the ground around the roots? What about the hard ground? Tilling maybe? I have never come across ground this hard. The whole lot is in the shade so I will probably be laying either Zoysia or Fescue b/c the owner has tried laying Bermuda years ago and it died very quickly due to not a lot of sunlight coming thru the trees. Any help will be greatly appreciated!!