Sam has a knife he can use to cut his hair. It’s perhaps not as precise as scissors, but he keeps it sharpened and it gets the job done. For the most part, he doesn’t cut his hair often, merely keeping it straight as it grows out.
Others will find sharpened scraps of metal to use if they live near humans. Those that live out in the wilderness often let their hair grow wild, or can use sharpened stones to cut it if it begins to get in their way, a problem while trying to survive.
Brothers Apart 