My husband and I found a local floor pro that is trying to expand his business by teaching people how to redo their own hardwood floors, for a fee of course. He has suggested that we rent a "slow-speed sander" also called a "buffer". He said that this sander will show grooves less than a drum sander. The problem is that all of the sanding screens alone will cost $300, according to him. Is there a cheaper, yet still 'easy' option? Neither my husband or I have any experience with refinishing hardwood floors.