first things first

US /fɜrst θɪŋz fɜrst/
UK /fɜrst θɪŋz fɜrst/
"first things first" picture
1.

primero lo primero, antes que nada

used to say that the most important thing should be dealt with before anything else

:
Okay, first things first, let's make a plan.
Bien, primero lo primero, hagamos un plan.
Before we discuss the details, first things first, we need to agree on the main goal.
Antes de discutir los detalles, primero lo primero, necesitamos acordar el objetivo principal.