For me, the hard part isn’t remembering how many times I’ve used a container or item in the last month or year. The hard part isn’t simply dedicating the time to comb through a bunch of stuff and get rid of the unused stuff.
The second sentence should read “is” not “isn’t?”
I sorta know the stuff I use and don’t use. Had a kitchen fire last year and had to get the whole house emptied out for smoke damage mitigation. I’ve thrown out, donated, or recycled the better part of two large dumpsters worth of stuff.
For me it’s about getting into the mode of going through and parting with stuff.