Correct

得心应手

/ de xīn yìng shǒu /
Strokes

Definition

lit. what the heart wishes, the hand accomplishes (idiom) skilled at the job/entirely in one's element/going smoothly and easily

Example

Definition

suit one's mind and hand—work with facility/high proficiency

1
pīngpāngqiú
乒乓球
lái
zhēnshi
真是
dexīnyìngshǒu
得心应手
  

He plays table tennis with great skill.

Definition

be serviceable/handy

2
Zhè
zhī
yòng
lai
起来
dexīnyìngshǒu
得心应手
  

This pen writes quite well.