@ichirow Yes, never give up, BUT in case of difficulties, you need to look back and see if you have the prerequisites to overcome them. For example, I don't know that much about image tools PIL, I need to google and read about it, to get at least a rough idea, because I start installing it.

Anyway, I have just installed Pimoroni st7789python library, without any problem, except I found PIL seems preinstalled in my Rpi buster 2019sep26 release. Here is the installation record you might like to compare and contrast later, when you try it: (1) st7789 library install record: penzu.com/p/2283cf99

My weblinks here seems incorrectly shortened by the forum. In case you find my link broken again, you may like to try the following: "h t t p s://penzu.com/public/2283cf99". Good luck, cheers/

I found the names of the connector pins a bit confusing, mixing up which pin is for MISO. Actually not sure Rpi MISO is used. So I skimmed the datasheet ot clarify. The 300+ pages of datasheet is voerwhelming. So I just cut and pasted a couple of figures to get a very rough picture: penzu.com/p/64d0dde5.