The modern method for getting a kit is almost entirely automated. Numerous Discord servers operate as "free kit servers for 6b6t.org". These servers often use bots. You join the Discord, "link your account to work the kitbot," and may have to wait in a queue or follow simple instructions to have a kit teleported directly to you. Searching for "6b6t kit Discord" will reveal these communities.
A set of Diamond or Netherite armor just strong enough to survive a couple of crystal blasts. Tools: A pickaxe to break out of obsidian spawn traps. Inside a Meta 6b6t PvP Kit: The Inventory Layout 6b6t kits