I have been slowly over the last 5 years getting rid of 1500 things. I am just shy of 1400 right now.
It has been a pain in the ass, figuring out online selling and shipping and packing and buying my 80th roll of packing tape.
PF has been a solid and easy venue for gun related items.
I would pick a bunch of the good stuff and post it on PF - 10 to 20 items. Stock up on boxes and tape.
The rest go to a gun store for someone else to sell.
Use the funds for ammo and a good training class.