自己人
those on our side; ourselves; one's own people; one of us
自己动手
to do (sth) oneself; to help oneself to
自给自足
self-sufficiency; autarchy
搬石头砸自己的脚
to move a stone and stub one's toe; to shoot oneself in the foot (idiom)
搬起石头砸自己的脚
to crush one's own foot while trying to maneuver a rock (to a cliff edge, to drop on one's enemy) (idiom); hoisted by one's own petard
与人方便,自己方便
Help others, and others may help you (idiom).
走自己的路,让人家去说
Go your own way, let others say what they like. (popular modern cliche); Do it my way.
金窝银窝不如自己的狗窝
there's no place like home (idiom)