AIBU! - I think my house is about to explode (not literally of course)

[Nonethemiser]

My DP and I have been married for almost 25 years - we both suffer from hording although theirs is much worse as they buy (far) more. We moved into our house in 2001. We had (have) a huge main bedroom but it was always full of boxes and bags. Originally I believed my DP when they said we needed more storage but even though we kept buying wardrobes etc the horde never went down. Now about 90% of our stuff in wardrobes never changes - the loft is full and so is the garage.
A couple of years ago we agreed we would tackle the problem. My DP came home from work with an online printout on how to tackle clutter (this is normally a positive sign). Page 1 - "deal with low lying fruit." I dug through to an Ottoman which we hadn't been able to access for at least ten years assuming 90% if not all would be allowed to leave - in fact the opposite turned out to be the case BUT we haven't used any of that bed linen in the two years since (although in fairness it has largely been reabsorbed by the horde.)
One of our New Year resolutions was to tackle it once and for all but since then I think they've spent one day on it (and achieved very little). I try to get on but the problem is that most of the horde is there's not mine. What to do? Any advice? I could just plough ahead regardless but I just know I will throw something away I shouldn't and then there will be hell to play. Both our DDs don't like visiting as they find the horde depressing - am I being unreasonable to think we can't continue like this?

Deal with your own stuff first and then speak to them.

Contact an agency that clears hoardes. They're not cheap but will help you with the psychological aspect as well as the practical side. They'll also focus on one room if that's all you can afford.

I largely have - there is some stuff that I can't easily get to but I have spent the last 48 hours wading through and almost everything that comes to hand is either theirs or ours (which is much the same thing).

I’d write out a schedule and stick it on the fridge. One room a week. Explain it needs sorting once and for all so that your kids will happily visit. Then ask them to box up anything they want to keep in one room each week. You can bag up anything not boxed up then transport to dump/charity. Ask DP to only keep 20%, only keeping things that are in use or outstandingly beautiful. If your partner struggles with this I would insist they do therapy because the impact on your life is too much and you desperately want the kids to feel welcome

Good advice but atm I'm struggling to get them to throw 20% let alone keep it. Also it would take well over a week for the worst rooms (downstairs isn't too bad as we still have visitors but upstairs is a nightmare). You may well be right about the therapy but can't see them doing it.