I was a technician working on the production side of the company building aircraft re-fuelers. We would take a truck chassis and fit it with a fuel tank (usually a 3000 gallon/5000 gallon), do all the necessary wiring, pipe fitting, fabrication, and adding of components (meters, hose reels, brackets, etc). After the build we would do the pre-flow check to make sure everything was working properly and make sure there were no fuel leaks.
The people I worked directly with were fun, but management was a joke. Constantly poking and prodding at employees asking "why is this taking so long" or "why are you doing it like that" and having pointless meetings about production. They never had a set plan on how to do things and always wanted to change things after they were built. Then they wondered why it took so long. Go figure.
Anyway, there was nothing really hard about the job, just the typical cry babies and people always complaining about something.
Two year performance reviews sucked. If you're going to wait two years to give someone a raise, shouldn't it at least cover inflation?