A house built in 1998 or 2006 usually has carpet over plywood in the bedrooms, and either engineered flooring or luxury vinyl in the main areas. None of that is refinishable in any meaningful way — engineered floors have a wear layer thin enough that one aggressive sanding ends them, and vinyl has none at all.
So the work here is installation, and the effort goes where it does not show. Subfloor flattening, fastening down squeaks, and correcting height at doorways, thresholds and appliances all happen before the first board goes down, because none of it can be fixed afterward.
Acclimation matters more in newer houses than people expect. The HVAC in a 2006 build runs differently than in a 1950s house, and the wood needs to reach equilibrium with the way you actually live before it is nailed or glued down. Boards that skip that step gap in January and buckle in August.