We swept and vacuumed and swept again. Then one by one, row by row, we made sure the nails and staples that held the plywood down were not sticking up. Ok - Now i already have raw spots on my knees and have not even started the hard part.Then we put the underlayment down and started the floor. Slow and easy, gentle - don't hit to hard or it dents. The guy's cut to length for us.5 hours later we have a floor......and blisters, and bruises and places we did not know we could be sore. But check it out - it was worth it.