Hey @julienleg just so happens, Sayan Mondal (Boundless Blending) has a new tutorial on modeling, shading and texturing shoes in 2.8X.
Sneakers in Blender 2.8x – PART I – Modelling [ Beginners ]
Sneakers in Blender 2.8x – PART II – Shading and Texturing [ Beginners ]
Hopefully these will help.
