Scrolled back through OP's responses.
The one that stood out for me, was the "house full of shit." I've got a house full of shit too OP. I'm a bit of a hoarder. Can't throw things away, convinced one day we will use it. We won't. It's a problem. This is a big house, and every cupboard, drawer, wardrobe, spare room, is packed.
Well. It was. We've been trying to move too. And DH had a (well placed) bitch fit at me, at the amount of stuff we have and how it's not coming with us. And he's right. I couldn't bear to just throw lovely things out, or just give things away that I'd paid ££ for.
So, I've been slowly going through each room. Stuff went into two piles. Stuff that's worth under a tenner, straight in a bag to the charity shop. Not debatable. Once I'd got that in my head, it was easier to do, and it felt great taking all the stuff to the charity shop and binbags (14!) to a children's clothing charity.
Pile two, is to sell. I use eBay, but only on the 80% off fees listing weekends. And try to picture, list and schedule 100 things for each time. Often I'll only have the time to do 20, but it's all in the right direction. My clothes, designer kids clothes, and weirdly my old baby blankets have brought in about £700 a month. It's crazy to me, what people want. Cleared the study, and found two old WiFi routers. God only knows what I thought I would use them for again. They went for £40 and £55. It's so worth doing.
There's a lot of ADHD in our household as well, so I get the over whelming aspect. Honestly, when you see the clutter go, you feel like you can breathe again, and the money rolling in is great.