First things first
Definition 1 of 1
Pro Tip 1/3Prioritize Tasks
Use the phrase to stress the importance of tackling tasks in order of priority. 
You'll feel overwhelmed if you try to do everything at once—first things first, start with your homework.
Pro Tip 2/3Step-by-Step
It's a reminder to approach complex situations with a structured plan, starting with the most urgent part. 
We need to clean the whole house for the party, but first things first—let's clear out the living room.
Pro Tip 3/3Introducing Topics
Start a conversation or speech by addressing the most crucial point using this phrase. 
Before we discuss our holiday plans, first things first—has everyone taken their vacation days?