I bought a house this fall and we refinished the wood floors before moving in this month. My father (a contractor) gave me the option of paying his professional floor guy to do it, or him doing it for the cost of materials, even though he's never done a floor before.
So the floors aren't perfect because he/we did it, the sanding between coats of poly could have been been done more carefully, there's some marks that could have been sanded a bit more to begin with, and there a little bit of streaking when the light hits it just right.
My mother, she is a perfectionist and can't let that go. So all I ever hear from her is "the floor was a cobb job, you can't sell that house until you get the floors redone again, you should have just paid the guy to do it right in the first place, you're going to have to do it all again but one room at a time now" and it's like 'holy shit, I just moved in and I don't even have a kitchen sink yet and boxes are stacked everywhere unpacked, and you don't even live here!'
So that's my story about wood floors.