manushka I wouldn't bother with explicit attempts to persuade DH. It will probably backfire.
Like others said, just get/borrow the book for yourself. You can start with the articles, but the book is good for the long run. (Do you need permission to spend a few pounds? Sorry, dont mean to be rude, i know for some money is tight). Then start your own process. Talk to others about it in earshot but not directly to him, nor pointedly at him. You can certainly do your own stuff and general household, as suggested.
Later, you can talk about stuff asking questions: we haven't used this Turkish tea set for 4 years. I know we got it on honeymoon which makes me reluctant but we just don't use it. I was thinking of getting rid of it?
Or: This pile is your stuff. I don't know what to do with it, it's yours, but it can't really stay in this heap in the middle of the room now can it? (When everywhere around it is pristine and beautiful)
My DH loathes the joy criterion, and I quote "I hate the joy thing" 
(please don't excommunicate me). But he will respond to more regular decluttering type talk, after about 4-6 weeks of careful modelling from me.
His process isn't my process. I am only responsible for my actions not his. This process should bring joy, not be a bone of contention or passive aggressive blaming and bitterness. It could be, things here are far from perfect. But I value my relationship. I am simply stepping into my own joy. He can come along or continue to mire in his own filth (we definitely have different standards of self-care). He is big enough to choose for himself. Its the nudge theory here, not the big stick.
I didn't plan this. I didn't even realise we needed decluttering. I just sort of started, and now we're all doing it. We still both have quite a bit to learn on the putting away front. This will be a big shift for both of us, though I'm getting better.