get (one's) feet under the table
To gain confidence in a new job. You've only been there a week—I'm sure you'll feel better once you've gotten your feet under the table.
get your feet under the table
BRITISHIf you get your feet under the table, you become confident and comfortable in a new job or situation. It took a year or so in the job to really get my feet under the table. I think I'll be able to do something about that next year. But let me get my feet under the table.
get your feet under the table
establish yourself securely in a new situation. chiefly British