Full of yourself - Idioms by The Free Dictionary
full of yourself
full of (oneself)
To have an inflated view of one's importance, to the annoyance of others. Oh, he is so full of himself! Despite what he's told you, he is not the most valuable member of our team, believe me.
full of yourself very self-satisfied and with an exaggerated sense of self-worth; bumptious.
ˈfull of yourself (disapproving) feeling successful and very proud of yourself because of it: He came to see us last week, very full of himself because he had just been promoted.