adorn oneself with borrowed plumes

apply oneself

Synonym of strive: to work hard, to complete an activity with good effort and focus.

be oneself

To behave or act naturally, without regard to how this behavior is perceived by others.

bear oneself

To behave and conduct oneself in a particular manner.

borrowed time

A period of time whose precise duration is not known but which can be expected to be quite limited, and at the end of which one's situation, benefits, or opportunities will be entirely terminated.

box oneself into a corner

To create a predicament or problem for oneself; to do something that leaves one with no good alternatives or solutions.

buy a dog and bark oneself

To do something that one has hired someone else to do.

carry oneself

To move, especially emphasizing the manner in which one moves.

come to oneself

To gain consciousness or self-control.