Capitalization of idioms in titles [duplicate]

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Which words in a title should be capitalized?

If I'm using an idiom in a title then should all the elements of the phrase be capitalized or just the ones that are usually in capitals?

For example, which of the following should be used?

be up and Running

be Up and Running

be Up And Running

If you're using an idiom, then in formal writing none of the words should be capitalized beyond what standard grammar and punctuation (beginning of a sentence, proper names, etc) require.

In a title, which words are capitalized will depend on the stylistic concerns of your medium, but generally it will be: first word, last word, and main words, with secondary words (conjunctions less than five letters, prepositions, articles, etc) left uncapitalized.

Conjunctions of more than five letters may be capitalized, and typically, in most professional publications, they are.

Idioms should be capitalised normally according to your usual style. If you normally capitalise a word, do so with the idiom too.

I would also capitalise the "be" too:

Be Up and Running