the blind leading the blind

/ðə blˈaɪnd lˈiːdɪŋ ðə blˈaɪnd/

used to describe a situation in which an incompetent or inexperienced person is advising others who have no knowledge or experience at all

Examples

1. Otherwise, it's like the blind leading the blind.

2. It's almost like the blind leading the blind 'cause if you are already in it, sometimes you can't see out.

3. Instead, this is a phenomenon of the blind leading the blind.

4. Finally, since we're going to be pushing both of them outside their comfort zones, we need some outside coaches to make sure this isn't a case of the blind leading the blind.