I don't know. I've largely failed at it. I have a ton of hobbies, and I feel like they're all not getting enough attention, and are taking up too much space. But every time I think about getting rid of my stuff for a hobby, I get more interested in it and actually do it for a bit, instead of getting rid of it.

The one hobby that I have massively cut down on is woodworking. I still have the tools, but I almost never do it now. It's noisy, dirty, dangerous, and expensive. So it's pretty easy to decide to give up on, in favor of other hobbies.