I once worked at a boatyard in San Diego. A friend came to visit, and I showed him all around the yard. We saw many yachts being worked on for many reasons. Later that night over drinks he commented that almost every worker in that yard was sanding something. The same can be said for sculpting a guitar neck. Hours of sanding. Sanding to actually do the shaping. Sanding to smooth out the scratches from sanding. Sanding, sanding, sanding. When asked how I know its smooth enough, when its done I must reply "its never done, they just come and take it away".