It's not that I don't know how to simplify or declutter. I've read all the books, or most of them, anyway. I've implemented lots of things, some with success. I get why decluttering is good and I strive for it.
No, what is holding me back from the last bit is that I truly have to deal with the emotional reasons why I'm attached to things. Sometimes getting rid of the things allows the emotions to follow, but sometimes you get blocked just short of getting rid of the things, and then...you still have the things, and wonder why it isn't easier just to toss them or rehome them or move them or whatever. And the reason is that you have emotional work do to, or personal growth that has to happen, before you can.
So here I go - I'm through with reading about it, through with berating myself. Time to do the inner work that will allow the outer work to happen!