That's great advice about not taking on too many kids at once. I did three kids for my first two years. Then I added a fourth. Then another 9 months went by before I added a 5th.

It is a big difference even between 4 and 5 kids

I also suggest making friends with another dcp and go for walks together in the morning or meet at the park....that sort of interaction will go a long way towards saving your sanity and making you feel refreshed