Well, I don't have any resources for you, but I just wanted to give you some encouragement. I am an elementary school teacher and I think that one of the most rewarding things is working with students with special needs and making a significant difference in their lives. I also think that perhaps you can make more of a difference with elementary students and see more results. Their youth makes them easier to "mold". However, I've never taught in a highschool, so I could be wrong. But, well, what I'm trying to say is that I think you should go for it. Take the challenge and try it out for a year. Maybe you'll end up loving it!