Starting, a beautiful, calm, crap free house doesn't have to be elusive, AND you can keep the DCs. Go through all the toys etc with DCs and get them to put 15 things each to one side to be dumped, charity shop......
Chuck out any broken crap stuff eg puzzels etc.
Get some good storage containers for the toys like those lovely colouful rubbery buckets in different sizes or baskets, whatever you like.
Go round your house and ANYTHING that you don't "love or need" seperate into bin bags and take them to the dump. Aim to fill up the car.
Get stuff off the floor and put it on shelves. It will make your house look more spacious and make hoovery much easier.
Thin out the DCs books and "artwork" and only keep the really lovely stuff. No point hoarding crap.
Open your kitchen cupboards, wardrobes, DCs cupboards, etc etc, pull EVERYTHING out and only put back the things you "love or need".
The rest goes to charity or you can do a car boot sale. DCs can sell their stuff and make some pocket money.
Open your utencil drawer and repeat process.
It will take a few weeks and will get worse before it gets better. Only aim to do a couple of hours or so a day.
When you've finnished you'll be SO pleased with yourself, you'll have more space, you'll wander round your house with such a sence of achievement and a new found love for your home.
Then you can clean the windows, buy yourself a couple of lovely old jugs and some flowers to put in them and we'll all come up (down?)
in the Dumpling Tour Bus and have tea and cake in your kitchen.