It is necessary to "cut one's teeth" on the non-glamorous parts of a field.

在一个领域中尝试做一些不那么光彩照人的工作来获得经验是有必要的。

youdao

He cut his teeth breaking up a mob-connected trucking cartel[2].

在打破勾结犯罪团伙垄断货车运输业的某卡特尔一案中，他小试牛刀。 （译注：cut one’s teeth [on sth.]

youdao

They found that those who have their teeth professionally cleaned and polished at least once a year cut their risk of a heart attack by nearly a quarter.

研究人员发现，那些一年至少一次为牙齿做专业清洗和打磨的人，患上心脏病的风险降低了将近四分之一。

youdao

After graduation she cut her teeth as a field reporter for regional television station NBN News.

CNN: CNN Profiles - Lynda Kinkade - Anchor

Miss Dando cut her teeth as a newspaper journalist in her home town of Weston-super-Mare, in south west England, after training in south Wales.

BBC: The golden girl of TV

If that was his first taste of life in the dugout, it was at Central Park that he really cut his teeth as a first team coach: first as player-assistant manager to Brian Welsh, then as his successor since 2008.

BBC: St Mirren invest faith in new manager Danny Lennon