get (one's) feet on the ground
To become comfortable with a particular situation. I know you're nervous right now, but I'm sure you'll feel better once you get your feet on the ground in your new position. I know you're nervous, but all freshmen are—you'll get your feet on the ground at school, don't worry. Once he gets his feet on the ground as a manager, I think he'll be a real asset to this department.
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