Hobbyists rig 3D model armatures by using beginner-friendly software (e.g., Blender), adding a basic armature aligned to the model’s structure (spine, limbs), weight painting to link bones to the mesh, and testing movements with simple poses.
Prioritize low-poly models (like a cartoon character) at first—they make learning bone placement and weight painting easier without overwhelming details.
Use Blender’s free "Character Rigging for Beginners" tutorial to practice—it walks you through simple steps with a basic model, helping you gain confidence before tackling complex rigs.