So just in case anyone cares, the cement grinder thing was ridiculous. It took Tony about 4 hours, and covered the entire downstairs in cement dust, even though we had a shop vac and a tarp to reign it in. I'm tempted to just wallow in despair and say : "why do bad things happen to good people!!!!!!!". Then I remind myself that "Oh no, my brand new hard wood floors are more difficult to put in than I thought" is definitely a first world problem, and in light of eternity is of no significance. So I'm just going to accept my dusty, unfinished house this week and embrace the chaos.