Could someone please update the Raspberry Pi Ethereum Full Node step-by-step?

As a total noob, and on behalf of several other people of my demographic in this space, I was hoping to get a streamlined and up to date set of instructions so that I may turn all of the pi's I have laying around into full nodes.

Bonus: Is it possible to do this with a 16GB micro SD and a 64-128GB cruzer blade?