Oh, its actually pretty easy, not to mention fun! All you need to do is take your characters head, clone it as another object, and get rid of every outside polygon along the hairline. Then, just select one, or several corresponding faces (not polygons, DBZ hair is more triangular). Then, extrude those faces and then move their verticeswhichever way you please to get the right shape. Pay good attention to detail and don't be afraid to use as many extrusions as necessary. The, take the top of the hair tendril, select the vertices, and weld them into a point. Adjust as necessary. Mesh or turbosmooth is not a good idea. DBZ hair is naturally a bit blocky, and smoothing it over will add an unnatural effect. The end result is that it is low poly, but visually pleasing. Oh, and don't forget to select all faces later and set the surface smoothing value to 32, so the hair isn't faceted.
Good luck!