Get above yourself - Idioms by The Free Dictionary
get above yourself
get above yourself BRITISH
If someone gets above themselves, they act as if they are more important than they really are. I just think you're getting a little bit above yourself. I did not like the way he had clearly got above himself.
be/get aˈbove yourself (disapproving) behave as if you are better or more important than you really are: She’s getting a bit above herself. She’s only been working for me for two weeks and already she’s telling me what to do!