do something blindfolded:
— I’ve been driving a motorcycle so many years I could do it blindfolded.
— My grandma knows this recipe so well that she doesn't measure any ingredients and could cook it blindfolded.
— I've been practicing my routine all summer and now I could practically do it blindfolded.
— You're so good I bet you could do your balance beam routine blindfolded.
— We have assembled so many party favors I'm sure that now we could put them together blindfolded.
— When I first did my paper route I needed a map but now I could do it blindfolded.
— I haven't hiked this Trail in 15 years but I could still do it blindfolded.
— Don't worry, once you learn how to ride a bike you'll be able to do it blindfolded.
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