How do I preview my custom unusual particle in-game?

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L1: Registered
Apr 18, 2020

I apologize if there is a thread that had this problem answered already, and that I just made this account some five minutes ago after making this thread, but I'm stumped.
I have made a test particle in TF2's particle editor, and would like to see how it looks in-game on a cosmetic item. The particle is saved in the tf/particles folder, and its name has been added in the particles_manifest.txt file.

I have found some stuff on reddit, the steam guides, and a thread on here about naming the particle something like "superrare_sunbeams1" to override the game's current particle for the Sunbeams effect, and making a bot in your server equip a cosmetic item to go with that effect. I do not know how to do either of these things. If I could be pointed in the right way about how to do this then that would be very helpful.