I had several goes over a few years but no luck. However once I started learning VR and Unreal engine and noticing all the things I could not do in SU and badly needed I gave it another go.
I used Lynda Training to do the 8 hour Blender Essential Training : https://www.lynda.com/Blender-tutorials/Blender-Essential-Training/87088-2.html
I then advanced to other tutorials and examples. I think it took around two months to get to grips with it.