The reddit guide is still 100% valid
The blockchain should automatically reorganize. It will definitely happen when the v4 chain exceeds the v3 chain. If your v3 (pre-fork) chain was synced to be longer than the current v4 chain, and you're having troubles syncing the current v4 chain, use `intense-blockchain-import --pop-blocks 7500` to manually discard 7500 blocks from your chain.
Yep, I'm seeing the daemon report being ever more behind in blocks at around the 7460 mark so I'll try the blockchain import command.
EDIT - how long does this command usually run for, and how do you know it is done?
EDIT 2 - well, I got an answer to the above question - it terminated "after throwing an instance of 'boost::exception_detail::clone_imp