Unfortunately I moved into a neighborhood where people actually take care of their yards. So, I have been trying to make mine presentable as well. Anyway.. my backyard has a pretty good slope to it.. maybe 20 degrees... and it receives pretty intense sunlight throughout the day. My problem is this.. that portion of my yard is unusually bumpy and patchy. There are some real "ankle-breakers" out there. I don't know if it's from erosion, frost upheavel, or voles (I did see one during the winter). Whats the best way to smooth out my yard and get a uniform lawn?