https://youtu.be/ToWRH4IXF7A

Checklist

• Freeze Transforms.
• Check for flipped normals.
• Center pivot on all objects.
• Move asset to origin.
• Is asset facing the front view?
• Name/Rename everything.
• Clean outliner.
• Cleanup Tool: Check for
  • N-Gons; and
  • Triangles; and
  • Non-manifold geometry.
• Delete display layers.
• Delete History.
• Set render stats to active.
• Check mesh scale.
• Disable smoothing preview.
• If model is symmetrical, is the mesh center centered on the X-axis?
• Delete selection sets.
• Make sure that the front, side, top, and perspective cameras are not hidden.