Any experience with refinishing hardwood floors?

[camerondiggs]

I am buying a 2-family home that luckily has had nasty carpetting covering the original hardwood flooring. I ripped up some of the carpet the floor looks okay but needs some refinishing. Anyone have experience with this? Is it worth it to pay for this service or is it easy enough to rent the equipment to do on one's own? Thanks for the advice in advance.