It was truly the worst day. A flight attendant's job is far from mundane. Their tasks can vary with each flight. We try to affect the mood of passengers, and if you have a good crew it can change the climate. And while passengers mostly see flight attendants serving beverages and food, the task requires planning and organization.
Airlines provide training for flight attendants.
It's a waste of money. Every airline will teach you everything you need to know. The first task, of course, is to be accepted for training. Some airlines, like Southwest, take applications at any time. Others, like United, consider applicants only during an open house.