
As a beginner, just a basic knowledge of the interface and tools available should be enough for you to execute a great 3D model. Rhinoceros has a similar interface to Autodesk products, thus, it should be easier for Autodesk users to grasp (which, no doubt, is many of us). Explore the software via Youtube, or among the many available online, and you would be able to build basic models on the software. If you’re clueless about Rhinoceros, but want to digest it quickly, a few days of full-time work to a couple weeks of partial input should get you there.

Time required: 3-4 full-time days/2-3 weeks of partial input
