For the switch, we will practice transitioning from D to A using a sliding finger.  Begin fretting the D:

1. Place the first finger on the second fret of the G string
2. Place the second finger on the second fret of the High E
3. Place the third finger on the third fret of the B string
4. Strum only the highest four strings in pitch (D to High E),m avoiding the Low E and A strings, by using more forearm rotation and less elbow motion.

To transition from D to A:

1. Remove the first and second fingers from the D shape simultaneously, leaving the third finger on the third fret of the B string
2. Slide the third finger back one fret along the B string to the second fret.
3. Place the first and second fingers down simultaneously on the second frets of the D and G strings, respectively.
4. Strum only the highest five strings in pitch (D to High E),avoiding the Low E string.

To transition back from A to D:

1. Remove the first and second fingers from the A shape simultaneously, leaving the third finger on the second fret of the B.
2. Slide the third finger up one fret along the B string to the third fret

3.   Place the first finger on the second fret of the G string

4.   Place the second finger on the second fret of the High E string

5.   Strum only the highest four strings in pitch (D to High E),m avoiding the Low E and A strings, by using more forearm rotation and less elbow motion.