the blind leading the blind
used to say that people who do not know much about what they are doing are guiding or advising others who know nothing at all

[TahlilGaran] Dictionary of Contemporary English ▲

blind leading the blind
a situation where someone is trying to show someone else how to do something which they do not know how to do themselves.
I tried to explain how the software works, but it was a case of the blind leading the blind, really.

[TahlilGaran] English Idioms Dictionary ▲

blind leading the blind
someone who does not understand something or does not know how to do something but tries to explain it to others; someone who has little ability or knowledge but is trying to help or teach someone else
It is like the blind leading the blind to watch the man try to explain how to operate the new computer.

It was the blind leading the blind when the teacher who could not cook was asked to teach the cooking class.

It was like the blind leading the blind when I tried to help my friend fix his car. I do not know anything about cars.

[TahlilGaran] English Idioms Dictionary ▲

blind leading the blind
One or more people who do not know or understand something trying to explain it to others who do not know or understand.
Jimmy is trying to show Bill how to skate. The blind are leading the blind.

[TahlilGaran] English Idioms Dictionary ▲