When it comes to any situation that involves doing something, there are two ways a person can view it if the person has never done it before. They can be unsure of their ability to perform the task, or they can be overconfident of their abilities. Overestimating their ability is what usually happens. You be familiar with the thought “that looks easy, I bet I can do that”.
This is especially the cause with hand to hand combat ability. A large portion of untrained individuals think they are somehow skilled despite never having been trained in it or have any type of proper experience. There are some females that think they can take on much larger men, and it is because there no one has given them a wake up call yet.