BIL was so sick of teaching after about 10/15 years. Sick of young people who didn't work, the stress of being accountable, acting as quasi social worker, marking, ten hour days and little appreciation.
He jacked it in to become his own master and opened a toy shop where he could provide educational toys and never worry about work at home. And then he realised that he needed to be open six days a week, if he shut the shop for a two week holiday it meant no takings for a week, lost custom or paying someone he didn't entirely trust to keep the shop open.
Then there were the difficult customers, over whom he had no authority, the orders to be made, the stock-taking, the VAT returns, the accounts, PAYE for part-time staff, difficult staff. It was hard work, stressful, turnover really mattered if there was to be any money left over, complaining customers, no sick pay, no generous pension, H&S regs, the council, etc, etc.
He packed it in after three years ........and returned to teaching. He is quite tight lipped about how hard it was and how teaching is easier. His wife spilt the beans.
Nod and smile.