A friend of mine is doing exactly that! She works as a teaching asst at a local Montessori school that her 4 year old is attending and her 1 year old is at home with a babysitter. She is not earning any money, but she is pursuing her teaching interest and taking it one day at a time.
If it is part time and your child would only be in child care away from you for a few months, you may want to consider it...
Go with your gut instinct and let me know what you decide to do.