The better bits usually mention something about 600 grit sharpening but that is power sharpening and if power sanding is any indication when compared to doing it by hand then the power sharpening at that grit will be finer than you can do with a 600 grit hone. I would go to the 600 for the final like the vid said to do. Pro sharpening is when it still doesn't cut that good even after you try yourself. Chances are by that time that the geometry is off and maybe the relief angle on the back side of the edge. That relief angle is pretty critical for getting a good finish and it's something that is usually not recommended to try by hand to retouch.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.