win (one's) spurs
To prove one's skill in a particular area and earn distinction or a good position as a result. Once you've watched the triplets for an entire day, then you'll have won your spurs as their caretaker, as far as I'm concerned. After getting my bachelor's degree, I won my spurs as a teacher by working short-term contracts in small urban schools for two years.
win (or earn) your spurs
gain your first distinction or honours. informal In the Middle Ages a knight who had won his spurs had attained knighthood by performing an act of bravery: a pair of gilt spurs were the distinguishing mark of a knight.
win/earn your ˈspurs
(formal) become successful or famous: You’ll win your spurs as a teacher if you can control class 5.