Working two jobs..? EMT/Dential Hygienist ?

Hello I want wanting to go to school/ training to become a EMT and a dental hygienist. I want to do both of these, I want to work part time as a paramedic at a hospital and also do the other job, maybe work in private practice. Is this possible? What is the normal salary for both? And will I ever have time off? Also, any tips on the differences to work in pediatrics? Thanks alot