Work and Guilt

I go back to work next week. I am looking forward to being at work, having a more firm schedule, and being intellectually challenged. I always get nervous this time of year, but it is also fun meeting all my new students, and getting to know them. Every year I feel like I have to get better and better at my job and so try to do something new and different. This year I haven't had much time to prepare and am feeling a little stressed and a little guilty for not having something spectacular and new planned for my class.
One thing I am dreading is leaving Stirling in day care. We have to have him go two days a week while RJ is working. How great is it though, that RJ can be with him the other three days. Still, leaving my baby with strangers is scary. The daycare we picked is right across the road from my school so I can get there in a hurry if I need to. And it is clean, bright, and looks like a very nice place for kids. I still get a guilty feeling however...
Should I get used to feeling like I am not doing my best for my job or my son?