He decided to take the law into his own hands and confront the thief himself.

She has taken matters into her own hands and started her own business.

She always trips over her own two feet.

It is a wise child that knows his own father.

it's an ill bird that fouls its own nest

Every man is the architect of his own fortune.

A prophet has no honor in his own country.

He managed to lift himself up by his own waistbands.

She managed to pull herself up by her own bootstraps and achieve success.

She managed to lift herself up by her own bootstraps and become a successful entrepreneur.