Flowchart of extraction (is it correct?, what should I change, modify?)

[Trevasotilo]

I have been reading the guides again, and wanted to know that I understood everything correctly.

I have decided I will follow vovin's tek wondering why is it so unpopular, what is so wrong about it ?,

What are its advantages and disadvantages in terms of yield and purity compared to other guides?

I have made a little flowchart of the process, the questions I have and things I dont understand are in the flowchart itself.

The image doesnt scale well so open in new tab or zoom in the page