To install:
It's really not rocket science, you need only a size 19 wrench and a ratchet with a 13 mm socket wrench.
The valve is only clamped with a tube nut at the sink.
To find out which end of the hose is warm or cold, questions and blow through the lever to the proper position.
In the assembly instructions, a sketch of the correct sequence is.
The picture does not show the correct order, it is used only for displaying the package contents.
I hope I could contribute something to their decision-making :-)