@oldmtwoman yep, yep, yep. Same here. When I start decluttering, I think, But I might need it in the future! So I have to cultivate a hopeful vision of the future. I have to believe that if I need that item in the future, I will be able to obtain it. For example, I had been hanging on to a pair of crutches since 2007!! Just in case I might need crutches again! Finally last year I gave them to a Salvation Army store. I have to believe that if I need crutches in the future, that I will be able to obtain them.
Also: I read someplace online that if you are trying to dispose of sentimental clutter, to take a photo of it. Keep the photo and dispose of the item. The sentiment lies not in the item itself but in the good memories and warm feelings you get when you see the item. Looking at a photo of the item can trigger those same good feelings and memories. This has been a helpful practice to me when I have set out to dispose of sentimental clutter.