I’m not sure.
I have no experience with FreeCAD or Fusion, but I use Solidworks at work, and learned 3D CAD using Creo/ProE. I had previously taught myself 2D TurboCAD which I understand to be a clone of AutoCAD, and before that, had learned CADAM, a 2.5D CAD system that developed into CATIA. I struggle with 3D in TurboCAD, but I made the transition from Creo to Solidworks relatively painlessly, without tuition, passed the basic user test, and would be confident to model pretty much anything, thought clearly aware that the 8-hours-a-day users will be a million times quicker than I will, particularly for those odd forms and weird geometries.
I guess the point I’m trying to make is that there’s a way of 3D design-thinking that you need to learn, and once that’s in your head, you need to learn the grammar of the system you’re using. Of course, when being taught a particular commercial system, these are simultaneous, like a child learning to speak. I think the grammar simile is apt - I read that if a child hasn’t learned a language by the age of 4 or 5, it’s simply too late, they then cannot learn. Happily, CAD is more forgiving, you can learn the concepts, and the grammar, at any age. And having learned the structure, the specific system grammar is easier to assimilate.
I’d recommend diving in, and hope the inevitable difficulties can be resolved without discouragement.
Simon