Wow, Zacs - I can't believe you wrote that seriously. You simply have no idea. Short of a long, long exposition you aren't going to understand. I understand about the pressures of keeping a firm going - my sister runs an MOT garage and employs 7 chaps, including my nephew. If an teacher gets some word wrong at the wrong time - you can lose the only chance in life some kids will ever have.
I repeat, you have to do it to understand.
By the way, do all these physically heavy jobs also require you to fire on all cylinders ALL the time with teenagers as well?