You need to provide more of a description of the problems you want to resolve. I personally consider experienced tradesmen that refinish floors to be a particularly good bargain. Before tackling this DIY consider obtaining some bids for professional finishing. There are many mistakes that can be committed inexperienced people using rental equipment. Considering the investment the floor represents, it is worth hiring someone with good references.

With that said, if you have specific concerns, please post back and folks here will try to help.