Clutter, clutter everywhere clutter

How do you sort through clutter? Easy I thought! Haven't used it for a certain time period, out it goes. Then I look at the stamps and remember what I thought I'd do with them, sigh. Or the little trinkets and my goodness the cardboard I've been saving! Why is it I'm totally ready to throw something out until I lay eyes on it and then, and then. Ugh! So how successful are you at letting go of things? My friend's husband says it won't spoil and you spent good money on it, keep it. My hubby, the pack rat says keep it, you never know when you'll want it. The reality is, my tastes are changing, however, guilt is getting the best of me. Give me strength. I have a small space and I'd really rather keep what's important and fascinating then what is maybe someday. Now is not the time to be sentimental.