case of the blind leading the blind

Fig. a situation where people who don't know how to do something try to teach other people. Tom doesn't know anything about cars, but he's trying to teach Sally how to change the oil. It's a case of the blind leading the blind. When I tried to show Mary how to use a computer, it was a case of the blind leading the blind.

Common Names:

Name	Pronounced	Usage
Odessa	-	Various
Meredith	['meridiθ]
Maeghan	MEG-ən	English (Rare)
Athanasia	-	Greek, Ancient Greek
Howell	-	Welsh
Marzia	MAHR-tsyah	Italian