Always stay focused. Try to limit your distractions and keep your eyes on the kids at all times. Avoid texting / Facebook/ calling people so you can stay committed to your main duty, since kids can get into trouble quickly. It goes without saying but we like to mention it anyway: never be under influence of alcohol or drugs when you need to look after children! Also, you are not supposed to smoke during the working day even if the children are not at home at that time.