TooMuchStuff, it does sound like you are dealing with a LOT. Be kind to yourself. I buy houseplants at nurseries or Trader Joe's and I lose a few every year because I'm still figuring out a watering routine that works for me. But I replace the ones that die and try again.
And yes, nswef is right, I'm a believer in baby steps and "no shame, no blame." Do what you can when you can and don't beat yourself up about it when you have a setback. That's not just my opinion, either - research on building habits says not beating yourself up when you backslide is key. I've been decluttering my house for 8 years, and it's ten times better than it used to be, but there's still work to be done. Nevertheless, I'm enjoying my home more than I ever thought I would.
One other mantra that has kept me going is the reminder that it's sometimes "three steps forward, two steps back." When I'm doing these batches of 40 hours, I make progress, but when I get busy, sometimes clutter accumulates again. I'm still making progress overall because I'm building systems, determining where things should go, and getting much better at recycling junk mail and reducing the amount of things that come into the house, but I have to forgive myself when I have slips. It's going to be a lifelong process for me, but working on it as I have with the incredible support I've gotten here has dramatically improved my quality of life.
Rosarugosa, thanks, as always, for your encouragement, and yay, nswef, on getting all that stuff out the door!