I have a 24ft by 52 inch pool. Need to level ground and remove 10 to 12 inches on high side. After about 5 inches it's all compacted clay. Can i use a tiller to keep breaking up soil and shoveling out, or should I just get the bobcat and do it. I ask because I need a tiller anyway for the yard, so figured to save the extra $250 on the bobcat rental maybe I could try a tiller... but I don't want to waste my time if it wont budge the compacted clay. This is a year old new construction home. Thanks.