Hold the cello properly with the stand
Memorize fingerings for the cello. Cello fingerings are numbered one through four and refer to the fingers of your left hand. The number one indicates the index finger should be used, two indicates the middle finger, three indicates the ring finger, and four indicates the pinky.
Play the first octave of the harmonic minor scale by using the following fingerings: 1-3-4-1-3-4-1. When you cross from three to one, slide down the string to the position just below where the index finger was. Like with all string-playing, listen carefully to learn where the position falls on the cello.
Perform the second octave by continuing to crawl down the cello toward the bridge and using the fingerings: 2-4-0-1-3-1-4. The zero indicates an open string.
Sound the third octave by using the following fingering: 1-2-1-2-1-2-1. End on the third octave F-sharp with fingering 2.
Proceed back down the harmonic minor scale by going in reverse and moving incrementally away from the bridge.