Congratulations 
I have 6, 3 girls and 3 boys, ages 14, 12, 10, 7, 3 and 10 months.
The oldest 4 are super easy (although 2 have disabilites, one takes a lot of extra physical caring for).
I find the toddler and the baby very hard work at the minute....but then i alway's find toddler's hard work and my baby is super clingy at the moment. I walk around the house with him literally clinging to me leg !. So it is hard at the minute but only because the youngest 2 are the age's they are, i know in time it will get easier again.
I've grown used to running a laundrette and catering service as i'm sure you probably already are, so not much change on that front 