輕車熟路

轻车熟路
qīngchēshúlù
  1. lit. to drive a lightweight chariot on a familiar road (idiom)
  2. fig. to do sth routinely and with ease
  3. a walk in the park

CEDICT

to perform a task with which one is very familiar with great ease

Wiktionary

駕輕就熟／驾轻就熟(jiàqīngjiùshú)之同義詞

維基詞典

Entry Composition

1 輕 qīng
  1. light
  2. easy
  3. gentle
  4. soft
  5. reckless
  6. unimportant
  7. frivolous
  8. small in number
  9. unstressed
  10. neutral
  11. to disparage
2 車 chē
  1. car
  2. vehicle
  3. machine
  4. to shape with a lathe
  5. Kangxi radical 159

classifier: 輛
3 熟路 shúlù
  1. familiar road
  2. beaten track