with (one's) eyes closed
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 closed! You should ask Johnny for help—he does this level of math with his eyes closed.
(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. with (one's) eyes closed
Unaware of the risks involved.