the.com/debutant

Someone doing it publicly for the first time, praying no one notices the trembling.

means A person making their first public appearance or attempt at something, whether on a stage, in society, or in a profession.

from From French débutant, the present participle of débuter, 'to lead off' or 'make the first move'—originally a term from games like billiards or bowls, where the 'but' was the target or mark you aimed for, and the first stroke of the game was the débutant's shot. By the 1700s French society had borrowed it for young women making their formal entrance into social life, and English picked it up wholesale, aim and trembling included.

origin
from French débuter, to lead off
usage
once meant society girls, now covers anyone unseasoned
irony
the label vanishes the moment it stops being true
sports sense
an athlete playing their first official match
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