Putting in a wood floor--suggestions?

I’m thinking of getting rid of a carpet in my place and putting in some wood flooring. I’m trying to decide between bamboo and salvaged wood. It’s also possible that there’s wood under the carpet that might be repairable. Is this something I can do myself and with the help of friends who might have done it once? Do I need professionals? How long will it take? How much will it cost? (The cost of materials I can find online—I’m more interested in the cost of labor.) Any bits of wisdom or mistakes to avoid on this topic would be appreciated.