Any time you work with kids, especially those with autism or another disability, it is especially challenging yet also very rewarding. As a behavior specialist, you will work directly with children and their families on managing, understanding, and changing behavior. I would strongly recommend getting some experience in the field especially if you do not have much exposure to kids with autism and/or other disabilities. In my area, there are organizations that hire "Behavioral Treatment Technicians" who only need a high school degree, and these folks are trained and then go into homes where they work with kids with autism. This allows you some professional experience to see if this is the route you'd like to go, and then as you continue with your education, your experience in the field may guide you into other areas that interest you as well.