Getting rid of stuff is rarely a matter of simply getting rid of stuff.
There is always more going on beneath the surface than meets the eye. The physical act of letting go is often not nearly as hard as the mental process of letting go. The things we own carry a history--ties to past people, places, and memories. That vase represents an argument with your mom, that letter a lost love, that sweatshirt an absent friend, that spoon the day your child ate their first food. Some of these associations bring joy. Some carry pain. Some a complex mixture of both.