Michael Hoover trembles. Armed with a paint sprayer, the charge artist at the Guthrie prepares to meet the enemy — a job he has never done before that he must do on a limited budget. It's been some 20 years since he began in the business. He has trained in studio arts at the University of Minnesota, done commercial work in the private sector, and worked in many paint shops. Yet, Hoover still confronts new problems that keep him awake at night.