From what I remember about substitutes in high school, all they did was give out instructions on what to do for the first few seconds, maybe make the class watch a movie and just read a book for the remainder of the class. Is that how it is for most classes? If I moved to New York City or Boston, would there be some competition among subs to get an assignment on a daily basis? Is there more demand than supply? How much could you expect to earn per month after taxes?