Here is the video showing my practice for these scales. I have found it critical that I have pairs of notes tied together in my mind. So in my mind I know that BC CD EF GA are each played on a single hole. The same is true for reading from the music notation. I am leaning to see pairs that will be played on the same hole of the harp. This knowledge along with knowing that B,D,F, A and be played as draw notes and CEG can be played as blow notes keeps you from making mistakes. The alternate ways of playing C and F are of course critical.