Time within Time.
Find the preparation of the instrument, and then when approaching a high note, use the connection of cords with a sob, to then find the placement, before you bloom into the resonance. Often, singers rush this process, and you will squeak. Often, between the preceding note and the consonant and vowel of the word with the high note much must be considered. If not rushed, and using the consonant or vowel to connect to the process and approach of the high note, you will have great technique and success! Singing is sighing, and must never be rushed or neurotic. Even seemingly fast coloratura must still have connection and longevity even in a 32nd note, TRUE!