find (one's) (own) level
To reach one's level of proficiency, comfort, or competency in a particular area. I'm so impressed with the interns—they've really found their level now. It takes time to find your own level as a teacher, but you'll get there—we all do.
find (one's) feet
To reach a level of comfort in a new situation. It took a while, but I've finally found my feet in my job. I know you're nervous, but all freshmen are—you'll find your feet at school, don't worry.
find (one's) voice
1. To find one's distinctive style or vision of artistic expression. I think this is your best story yet, Betsy—you've really found your voice as a writer. It takes time to find your voice, but I'm confident you'll get there by the end of our photography class.
2. To regain the ability to speak, especially after something frightening or startling has happened. It took him a minute, but Pete found his voice again after we startled him at his surprise party.