Progression depends on reliable judgement and control, not simply job volume.
Readiness checks
- Consistent identification of common materials.
- Independent testing and process records.
- Understanding of the relationship between finishes, colour and adhesion.
- Prompt stopping when abnormal changes occur.
Training sequence
- Verify foundational skills with standard cases.
- Add focused exercises that change one variable.
- Move into actual repairs under an instructor's supervision.
- Extend independent work only after durability and handover checks are satisfactory.
Dramatic before-and-after images can distract from grain, feel and lasting stability. Advanced work requires clearer limits as well as broader skills.