to suffice to oneself: to be self-sufficient. Obsolete.

to shift for oneself: to provide for one's own safety, interests, or livelihood (implying either absence of aid, or, sometimes, want of concern…

to work out (one's own) salvation; frequently figurative, to be independent or self-reliant in striving towards one's goal.

intransitive. To rest or rely upon oneself. Obsolete. rare.

to stand on (also upon) one's own (two) feet and variants: to rely on one's own resources; to be or become self-reliant or independent; (also) to…

to stand on (also †upon) one's own (two) legs: (originally) to stand upright without assistance; (subsequently) to be self-sufficient or independent…

intransitive. To shift or fend for oneself. U.S.

to fish for oneself: to get all one can; to seek one's own profit exclusively; to rely on one's own efforts.

to live on one's hump: to be self-sufficient, to operate from resources accumulated earlier.