I've been doing this over 4 years now and have my daycare running like a smooth engine! Great families, great kids and great routines. There will always be problems, but if you can work with the parents to solve the little phases that all children go through you will be fine. Once you are running smoothly and your contract is being followed all you have to do is make sure you terminate anybody who makes you unhappy. Interviewing and transitioning new kids should be the most stressful parts of the job and if there is anything else that arises, fix it fast!