I did this about 9 months ago. One of the challenges I have found is that DS was very used to a schedule from daycare. Eat, then this, then that, etc. When we moved, and finally got settled, you could tell there was a sort of hunger for that. And that is not me! So, I have spent a long time working on trying to create a "rhythm" (to borrow from Waldorf) that will provide the structure he has learned to depend on but have enough flexibility that I don't go nuts.
I am still figuring it out. I feel like I am not so good at this stay at home thing (but I got pregnant about 4 months into it, so I can't say that feeling awful doesn't help). I hope to spend the next 4 months working on getting the house more organized and have a better flow as well as a better flow for our days to help with the transition of the new baby.
I enjoy staying at home. I wish I felt I was doing a better job, but I think that comes with time.
It will help that you were a teacher. I was an engineer surrounded by men all the time. This is so absolutely completely different
Find some other SAHM friends. That has been invaluable!