1. establish yourself in or become used to a new situation
find your feet in a new job/country
This idiom is used to express reaching a level of comfort and capability in something new, especially something that is difficult at first. It is common in both a social and professional context as if you have adapted to and learned to deal with a new situation or job, then you have 'found your feet.' The expression is modified from the idea of a child first learning to balance on its feet, allowing it to support itself and move around. Phrases with a similar meaning include 'settle in,' and 'get into your stride.'