HSK 7-9
得心应手
déxīn-yìngshǒulit. what the heart wishes, the hand accomplishes (idiom) skilled at the job; entirely in one's element; going smoothly and easily
他操作这台机器已经得心应手。
Tā cāo zuò zhè tái jī qì yǐ jīng dé xīn yìng shǒu.
He now operates this machine with complete ease.
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Appears across levels (7-9) in the HSK 3.0 word list.