Realisations ... from being a teacher

As well as what you teach me, there are a few things I've recognised since changing career to be self-employed in the driving tuition industry:

Office "pink day", previous job (2006)

1. Avoid complicated words, and especially tenses
2. Enjoyable company (the client's and yours) is key
3. Flexibility is paramount
4. People differ, and are unpredictable ... and examiners vary more than ideal
5. It takes a lot to damage a rear tyre … but little to kill a front one
6. Driving tests should not be language tests
7. Rarely describe variations that didn’t actually take place
8. ​Note your own critical oversights
9. Appraise "where you're at" after 1, 2, 3, 5, 10, 15, 20 years
10. A bag on the front passenger seat can end up operating the dual brake!
11. Be generous with time and resources: model how you want clients to carry on
12. Don’t compare yourself to a DVSA ideal: as with a test report, acknowledge your “faults” but applaud the unmentioned positives

And what's got better?