While trying to get my head around Rhino for jewellery, my friend Ken from 3dcadjewelry told me about a "new" Beta program called MoI.
Jumped onto the Beta & within weeks I'd started to "get it", which in turn helped me to better grasp using Rhino when needed.
Although I'm no longer making jewellery, I'm still on 3dcadjewelry & so help promote MoI to those having trouble with grasping Rhino.
I'm now using MoI for any CAD that's needed when creating my Tattoo Machines.

HTH, Colin