I have a Bitcoin ABC full node. How do I split off Bitcoin SV?
I made a tool (linked by user MCCCS) but you can actually do the splitting in regular Electron Cash too. Electron Cash is great for this because unlike most wallets, you can connect to both BCH and BSV servers. Just get some free BCH-only 'split dust' from free.bitcoin.com or from forkfaucet.cash, and mix that with your coins. Then switch to BSV and make a distinct transaction there.

The key points are:


During splitting, only send amongst your own addresses. That way if you screw up, you haven't lost anything.
After splitting, wait then verify that your coins are split (have different transaction IDs)


Some guides:


https://www.reddit.com/r/btc/comments/9yefov/if_you_want_to_dump_bsv_some_tips_on_splitting/
https://news.bitcoin.com/follow-this-branch-a-guide-to-splitting-bch-and-bsv/
https://cdn.discordapp.com/attachments/412369923541565463/514774626849521672/bsvbch-2.pdf