Okay, maybe I should have explained in more detail, sorry:
What you hear is first of all a chopped vocal sound (see video above and this one for more info about adding fx):
That’s gonna be your first track.
Now, you’ll need a second track with a pad sound, you could start with a choir sound but anything will do that serves as a pad. This pad plays the harmonies. If you listen very closely, you’ll hear that the pad sound fills in the blank spaces around the vocal sounds while it’s still audible underneath at a very low level - it’s sort of pumping around the vocal. That’s a sidechained pad that is triggered by the vocal track. What the sidechain compressor does: Every time the vocal kicks in the volume of the pad sound is turned down. This is this pumping effect you hear.
Here’s a quick tutorial on sidechaining:
Here, the kick is your vocal sound and the bass is your pad.
You’ll find plenty more on sidechainig, both Chris Selim and Dom Sigalas have created good YT videos on that subject.
I didn’t want to overwhelm you with info since you said that you are no expert.
To sum it up: You’ll need two tracks - one with vocal chops and one with a pad playing harmonies. On top you need two different techniques - sampling and sidechaining.
It might sound really difficult but it isn’t once you’ve wrapped your head around the concept. You can definetly do it ! 