I have had quite a number of good teachers - some in primary school where it really matters, a few more at second level, and several at university, from whom I learned a lot (including what to do, and what not to do, in the classroom, invaluable when I became a teacher myself).
However, while I loved both studying and teaching at university - where one could savour the saving grace of students actually studying subjects that they had applied to study, that they had wished to study, in other words, where one could assume - or, hope for - an interest in the subject on their part, which is something that truly matters - you couldn't pay me enough to teach disinterested, sullen, adolescents - at second level. Between raging hormones, peer pressure, exam pressures, no. Just, no. No thanks.
And I am full of admiration for those who can - and wish - to do it.
Successfully challenging, and stimulating and sustaining the interest of a roomful, a bunch of hormonally challenged teenagers, of differing abilities, of differing degrees of interest in (and motivation to study at) your subject, (yes, there will always be a handful of students at second level who actually are interested, or whose interest can be stimulated) and levels of maturity is a skill not many people can lay claim to.