leading

the 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.

See also: blind

a leading light

an important and respected person in a group or organization. A leading light in the art and ballet world, he was a close friend of Princess Diana. (often + in) Jeffries, at 23 a leading light of the campaign, was the first to speak. (often + of)

See also: light