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.
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.
(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.