know what you're doing/about

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know what (one) is about

To be adequately prepared or knowledgeable enough to do something; to be confident in one's abilities. You couldn't find a better leader: he knows what he's about, he stands up for his values, and he isn't afraid to put the wellbeing of other ahead of his reputation. I know her strategy may seem unorthodox, but trust me—she knows what she's about.
See also: know, what

know what you’re ˈdoing/aˈbout

(informal) have experience of doing something and therefore understand it fully: ‘I’m worried about David using that machine.’ ‘Don’t worry. He knows what he’s doing.’
See also: know, what
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