with one's eyes closed

Adverb

figuratively

(figuratively) With very little effort.

Japanese Meaning

ほとんど努力を必要とせず、非常に容易にできる様子 / たやすく、簡単に実現できる状態

A seasoned carpenter can assemble that piece of furniture with one's eyes closed.

経験豊富な大工なら、その家具の組み立ては朝飯前だ。

Sense（1）

(figuratively) With very little effort.