The dough should be slightly sticky and pliable. Check out the video to see what the dough should look like. If kneading by hand, once all the flour is incorporated, I find it easier to spray some cooking oil on my work surface instead of adding flour. If you add more flour this will change the consistency of the dough and risk ending up with tougher rolls, while the oil will keep your dough from sticking to your hands or work surface.