What’s a good phrase or idiom similar to "going in blind" or "jumping in the deep end"?

Question

A while ago I had a con­ver­sa­tion with a col­league of mine, and 
we’re talk­ing about an ap­pli­cant who ap­plied for a po­si­tion
that he does not have any back­ground knowl­edge of, no ex­pe­ri­ence
with the said field and com­plete­ly un­a­ware of what he is get­ting
him­self in­to.

He had not even done any re­search be­fore­hand and so did not
un­der­stand even the name of the po­si­tion.  I said that he was
“point blank” with my col­league and we con­tin­ued our dis­cus­sion:
none of us no­ticed I had used the wrong id­iom/phrase.

Later tonight, I felt that some­thing was wrong and re­mem­bered
the phrase I used wrong­ly, so I tried to think of that spe­cif­ic
phrase that I meant to say but had failed to do so cor­rect­ly.
It’s sup­posed to mean some­thing like “go­ing in­to a gun­fight
emp­ty-hand­ed” or “tak­ing an ex­am with­out study­ing”.

Goo­gle not seem to help, and I don’t know any na­tive English
speak­ers in real life.

I post­ed this on red­dit, and got some real­ly close an­swers like 
“Jump­ing in the deep end” or “Go­ing in blind” which are close to
what I was mean­ing to say cause it sup­posed to sound like go­ing
to reck­less­ly com­mit your­self in­to some­thing while be­ing
ig­no­rant of the things you’re about to en­count­er, or some­thing
like that.

But it still doesn’t sound right; can you help me find the phrase
I’m look­ing for?

Ian · Answer

A few possible idioms that come to mind are:

"Rushing in where angels fear to tread" (line from Alexander Pope, leaving implicit that the rushing is done by a fool). This seems better than "jumping in the deep end", which speaks more of courage than clueless bravado.  https://en.wikipedia.org/wiki/Fools_rush_in_where_angels_fear_to_tread

"Like a bull in a china store", implying a total and inexcusable lack of awareness.

"All guts and no brains", similar to the first one. This would be a play on the idiom "All brawn and no brains" quote by JFK (which I can't find a link to, sorry).

1006a · Answer

An idiom that would work well in this context is out to lunch. Its two figurative meanings together would make a pretty good description of your candidate. From Dictionary.com:

Not in touch with the real world, crazy; also, inattentive.

From what you describe, your applicant must have been out of touch with reality to apply and completely oblivious to the requirements of the job. The fact that the idiom derives from the literal meaning of people being out of the office rather than paying attention to business makes it work especially well for a clueless job applicant.

If a single word would work for you rather than a phrase, I think both oblivious and clueless would also be reasonable choices in your example.

tblue · Answer

The applicant was "out of his depth".

Like someone whose feet cannot touch bottom in a pool and they are floundering.
"This job is out of his depth." Lacks grounding and qualifiations.

Applicant was "in over his head". Another water phrase meaning he couldn't even tread water in the interview and was drowning in ignorance.

Could it be that "point blank" was akin to "shooting blanks" - no real ammo in his intellectual gun?

What’s a good phrase or idiom similar to "going in blind" or "jumping in the deep end"?

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What’s a good phrase or id­iom sim­i­lar to "go­ing in blind" or "jump­ing in the deep end"?

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What’s a good phrase or idiom similar to "going in blind" or "jumping in the deep end"?