V2 Hub died and have to change to new one

[geko]

This has been discussed many times. See, for example

Migrating to a new hub

I was unfortunately hit with a bad firmware update that fried my zigbee functionality. SmartThings tried to repair it but is not able to bring back my existing hub to 100% functionality. They sent me a replacement hub - yippee! - and now I am forced to undertake a very laborious manual migration to the new hub. I have about 100 devices and lots of automation and I leverage home monitoring. Any thoughts on the best place to start and any migration tricks I should be aware of?