Das ist dein Bier.
That is your beer. It means that the matter is yours to handle. It can also sound dismissive.
in Eigenregie
Under one’s own direction.
auf eigene Faust
On one’s own fist. It means on one’s own initiative.
Das überlasse ich dir.
I leave that to you.
eigenverantwortlich
On one’s own responsibility.
Viele Wege führen nach Rom.
Many roads lead to Rome. The goal counts, not the route.
Hauptsache, das Ergebnis stimmt.
The main thing is that the result is right.
die Rückdelegation
Delegating back upward. Passing one’s own decision back up the hierarchy is considered improper. Whoever holds the authority to decide is obliged to use it.