Hi Cyril, you're very welcome.
Even Hair is easy to set up, it can go relatively deep, and yes, the application is mostly parameter-driven when one excludes the Styling tools. In other words, the number of parameters and tabs doesn't support a lot of intuitive handling; what is possible needs to be known. The content mentioned below puts a great deal of light on that subject.
There are two series over at the old Cineversity
https://www.cineversity.com/vidplaytut/hair_overview_the_hair_menu_-_part_1
Sadly, two detailed series are available with an older GUI, but the functionality hasn't changed.
• The Hair Menu
• Everything Hair
There was a DPP episode about Hair:
https://www.youtube.com/watch?v=KiElJ-ssIqg
I hope that helps.
My best wishes