C Major uses Scale Form V which involves two squeeze shifts. After the first squeeze, your hand will be in Position X with 4 on C (2) and F (1). Both notes are at fret XIII.
When descending, you’ll squeeze to Pos. X to play F on (6) with 4 at fret XIII.
- Begin with m,i alternation; when comfortable switch a,m (m,a) alternation.
- Maintain legato connection. When descending the scale, strive to have your left-hand fingers in a prepared posture, hovering near the frets before they play.
- When secure, practice the scale while vocalizing the note and watching your hands.
- Finally, play and say the scale one stroke per note from memory.