I haven’t read the thread but as an ex-hoarder I can tell you what works for me. Life-changing!
Choose a room. Take everything small and cluttery out of the room (onto the patio or into the landing if the room is upstairs). Give the room a quick clean / wipe surfaces if you have time. Remind yourself that you can put anything/everything back if you want to. Enjoy looking at your clean, uncluttered room.
From all this stuff on the landing, choose the things you want to put back in your room and take them in one by one, putting them where they look nice or will be most useful.
There will be a mountain of stuff left on the landing that you will realise you do not want back in your room! It is completely different, choosing what you want to put back in your room vs identifying things to bin. With the stuff left over, choose between putting in a memory box, recycling, charity shop or binning it. It’s easiest if you can have someone else to bin it for you - or it is for me because I don’t like getting rid of things. Try to do it quickly.
Enjoy your relaxing, clutter free room!
Choosing what to put back in your room is completely different from choosing what to take out.
Occasionally you will bin things that in a year’s time, you will wish you had kept. At this point, remind yourself that you’ve enjoyed your clutter-free room for that whole year and it was worth it.
The Marie Kondo idea - something like saying ‘thanks for being there when my kids needed to show their love for me / when I needed your help/ etc’ to your items as you eliminate them - was also helpful to me, but once I got into the habit of taking everything out of a room, I didn’t need that method so much.
Good luck with your decluttering! A relaxing life awaits you! I don’t think I realised how stressful being in a room with lots of stuff was for me, I feel I can breathe easier in emptier rooms. Definitely worth it.