Knitting sleeves in rounds

My honest respect to all knitters, to knit the sleeves in rounds overwhelms me as a new knitter a little. But my ambition is aroused and I will work hard to get this done as well! Just why does it look so easy when you are doing it?

(My first knitting project: Metropolis Cardigan | The Fibre Company)

from Instagram: https://www.instagram.com/p/BgqYOBwFI5X/