beginner's luck

noun

1. the initial good fortune or success commonly supposed to come to a person who has recently taken up a new pursuit, as a sport or game:

   Catching a large trout the first time you go fishing is simply beginner's luck.

Word History and Origins

Origin of beginner's luck¹

First recorded in 1895–1900

Idioms and Phrases

Good fortune in a first attempt or effort, as in I often use a brand-new recipe for a dinner party; I trust beginner's luck . [Late 1800s]