Stress
Like any job where there's lots of money involved, there are deadlines, and it can get pretty stressful when it comes to crunch time.
You'll also be sweating it out while you wait to pass safety inspection, hoping nothing goes wrong.
If there are problems with the ride's safety and folks get hurt, that could mean the end of your career.
Still, odds of something going wrong on a coaster are one in a million. You have a greater chance at being in a plane crash than a coaster crash. And even then, odds are pretty great that you'll be just fine.