Question
I have an uneven area in the backyard probably 20 x 30 area...there is no general pattern to the unevenness, somewhat rolling, some "potholes"...some parts are lower and some parts are higher than where the existing lawn is...I would like to level out these areas-----I am guessing that it'll need 8 to 10 yards of topsoil.  What tips do you have for me to help me get the area leveled out?  Should I rototill the whole area and set up stakes and strings or what?
Thanks!

Answer
Hi Jon,  Based on your info, 10 yards of soil will raise the entire area a little over 5 inches.  If this doesn't cause ponding in other areas or make your storm water runoff go somewhere it shouldn't, then your only concern is the type of soil.  If you're using exactly the same type soil that's there now, then there's no need to till. Spread it, level it and pack it down slightly and you're done.  If the soil texture is different, then the new soil should be incorporated into your existing soil.  If you lay a looser soil mix on top of most soils, it dries quicker which may result in drought stress or winter dessication.  In prolonged periods of rain, root rot is possible and most plant roots take the path of least resistance and never penetrate the subsoil.  
If this area is to remain lawn, try to find a source for the same type soil you have now.  It will save you grieve down the road.  If the soil is well pulverized (and I would not buy it if it's not} spreading it is fairly simple and I have a 6' piece of chain link fence I use to level with. Drag it behind a lawn mower with a couple of concrete blocks on top and it smooths the area very well.
Tamp the surface down slightly to prevent erosion and your done!
Good Luck,  Jim