Last year, I went on a mission to rid my home of all carpet. With pets and this South Carolina red clay, it's just too hard to keep clean. Not to mention, I just find carpet gross in general with all it's creepy crawleys hidden deep inside. This room was my first project. It was an office, but once I re-did the floor, we changed it to a bedroom.
The floor underneath the carpet was in very good condition. I went to Home Depot and had them cut this 1/2 inch furniture grade pre-sanded plywood into 2x2 squares. I installed it using liquid nails, and wood screws. Wood screws are not visible because I sunk the screws and covered with matching wood putty.
Finally, I put about 3 coats of water based polyurethane over all to complete the project.