Google "Unfu** Your Habitat." With the "ck".
It seems silly, and it's kind of like flylady, but it's keyed into people who have disabilities and are overwhelmed by the size and scope of the household mess. There is also an app available for download. It breaks the projects down into increments and will provide projects for you if you don't know where to start. I don't follow it to a T, but it gave me a great foundation to start from. My house looks the best it ever has since I've been an adult. Still kind of cluttered from my umpteen projects, but completely livable.
Be ruthless! You can do it.