I shall provide you with information regarding the meaning of these three idioms:
1) "down to the wire" --> this informal expression is used in sentences to convey the idea of "until the very end."
* If you do something down to the wire, you continue doing it until the last possible moment.
E.g: "Negotiations are likely to go down to the wire."
E.g.: "We're just about down to the wire with this project."
2) "ins and outs" --> this idiom is used to mean the particular details and nuances of a situation, task, etc.
E.g.: " I'm not surprised he made such a stupid mistake - he doesn’t know the ins and outs of this business."
E.g.: "You should not have told her about our plan - Don't you know the ins and outs of a surprise party?"
3) "rude awakening" --> this is an idiom used to refer to the shocking instance of learning the unpleasant or unwelcome truth about a situation.
E.g.: "We had a rude awakening when the waiter brought us the bill and we saw how much we had spent on dinner and drinks."
* If you have had a 'rude awakening', you have been forced to realize the unpleasant truth about something. ( e.g.: "She thought the exam was going to be easy, but after reading all those questions, she had a rude awakening!")
Did you get the idea?
Hope that helps!!!
Should you have any further doubts, do not hesitate to contact me. I shall be pleased to help.