The following checklist will be mentally run through before I play the first note of whatever I'm playing.
Checklist
- Feel the 'sit bones' (2)
- Sit up straight with my head on top of a the spinal column
- Form my embouchure (3)
- Breath well (4)
- Insert clarinet, feeling the lip pressure all around the mouthpiece
References:
(1) - Arnold Jacob
(2) - See Embouchure Building
(3) - See Embouchure Building
(4) - Maria Callas at her masterclasses at Julliard often said "Take the time to breath well." There are, of course, hundreds of ways thinking about and accomplishing this -- again, I refer to Embouchure Building and Arnold Jacobs for guidance.