If you know the basics of how and why it happened that is most of it. Hive is going to be (at the beginning) an exact replication of Steem, just with the Steemit Inc stake removed and a small change to the witness voting rule designed to prevent exchanges from easily staking funds and voting to overthrow the witnesses.

Just go to hive.blog after the fork, your same username will be there, all your previous post / comments / interactions / etc. You will use your same keys. Nothing really changes from the user perspective, but once you start posting from hive.blog your posts and interactions will be in the Hive blockchain instead of the Steem blockchain.