I have done this 3 times. The first two were my pre-baby gift to myself. I wanted a really clean house when I came home from hospital. And the last time was exactly the same as you, three kids and everything was on top of me so I outsourced the spring clean.

I had two cleaners (husband/wife team) for 3 hours and it cost me $200.

Each time the best money I have spent

GO FOR IT!!!