Stress
Though this job generally isn't a nail-biter, you'll still deal with a decent amount of stress. At the salon level, you're sure to encounter incredibly picky, hard-to-please clients with specific requirements for their nails. Once your profile rises, you could be under pressure from photographers, magazine editors, and model management to be quick, reliable, and perfect. Of course, once you reach that point, you'll totally have it down.
Probably.