Odds of Hanging On
Simply put, if you can't handle the heat, stay out of the kitchen—and being a special education teacher comes with a lot of heat.
You need a whole lot of mental strength to be a teacher, and even more to be a special education teacher. That being said, many schools have a hard time with their special education teacher retention rate (source).
But if you have patience, will power, and above all, the love for what you do, odds are you'll be in it for the long run.