Well-educated ambulance staff is a prerequisite for high-quality prehospital trauma care. The aim of this study was to examine how nurses in the ambulance service experienced participation in trauma simulation. Sixty-one nurses, working in an emergency ambulance service, performed simulated trauma care on four different occasions and afterward rated three statements on a 5-point Likert scale. A descriptive and inferential analysis was conducted. There are statistically significant increases between the pre- and posttests regarding all three statements: I think simulation of severe trauma with manikins is realistic (0.23 or 6% increase), Simulation is a suitable method for learning severe trauma care (1.3 or 38% increase), and I am comfortable in the situation learning severe trauma care through simulation (0.74 or 19% increase). With the experience of realism in simulation, participants become more motivated to learn and prepare for future events. If the participants instead feel uncomfortable during simulation training, they focus on their own feelings instead of learning. In a realistic simulated environment, participants are prepared to understand and manage the emergency care situation in clinical work. Participants learn during simulation when they are outside their comfort zone but without being uncomfortable or experiencing anxiety.