Can you help me understand this quote?
So, I was scrolling down my twitter news feed and suddenly this quote appeared:
"Du musst nicht die ganze Treppe sehen, nimm erst einmal nur die erste Stufe." from Martin Luther King, Jr.
I managed to understand the first part: "Du musst nicht die ganze Treppe sehen,", but not this part: "nimm erst einmal". I mean, what is that "einmal" doing there? And why there are two "erste" in the sentence?