mommyB have you written a list of how decluttering will help and picked a spot to start in. I took a before and after pic of each room so I would see how much progress I'd made even though it was still ongoing.
Last weekend I cleared out my cupboard under the stairs and gave all the old paint and diy stuff away on freegle as well as some books. I've other books to list for sale online today. Yesterday I took a couple of bags of my old too big clothes to the charity shop and it feels really good to know they're gone and I'm never going to be that weight again.
Decluttering makes your life easier you don't lose things, cleaning is quicker, it's not embarassing when people call round. But it's the same as the weight loss process it forces you to confront and deal with emotional issues, suurounding yourself with stuff can be very comforting even if you don't admit it. It made me think about how empty my life was apart from all the stuff, what defines me as a person rather than all the books I've read movies I've watched etc. Weight loss and decluttering has really changed things for me in my whole life. For the better. But it is tough so don't beat yourself up or think that you're lazy because you haven't got there yet. You will, pick somewhere small to start- one drawer or a table or under the bed. Then just keep going with a small bit of a day