with your eyes shut

with (one's) eyes shut

With very little or no difficulty; in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I could do it with my eyes shut! You should ask Johnny for help—he does this level of math with his eyes shut.
See also: eye, shut
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

with your eyes shut (or closed)

1 without having to make much effort; easily. 2 without considering the possible difficulties or consequences.
1 1994 New Scientist I can knock off pages of eco-babble for the UN with my eyes shut.
See also: eye, shut
Farlex Partner Idioms Dictionary © Farlex 2017

(be able to do something) with your ˈeyes shut/closed

(be able to do something) very easily, especially because you have done it many times before: She’s driven up to Scotland so often that she can do it with her eyes shut.
See also: closed, eye, shut
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
He always takes the best bit, if you don't punch him for it; and if you choose the best with your eyes shut, he changes his hands.
Wait till the Education Secretary and mother of four, Ruth Kelly, is on and listen to her with your eyes shut.
IT'S hard to review a movie you've watched mostly through your fingers and with your eyes shut, but here goes.
If you don't want to make that much effort, try taking a shower with your eyes shut, memorise telephone numbers, play Scrabble or use your other hand to brush your teeth.
Sneeze-driving is dangerous too - a quick ha-choo on the motorway doing 70mph and you'll cover 100 feet with your eyes shut.
2TOUCH Again, sit cross-legged on the floor with your eyes shut. Get a friend to brush three different objects across the back of your hand, then write each one down.
3SMELL Sit on the floor with your eyes shut and get a friend to waft three different scents under your nose, one at a time, then write them down.