How should I personally prepare for when transformative AI arrives?

Don't train in careers which are about to become fully automated (but being a human-computer Centaur might be a good idea).

• Don’t be a wheat harvester, become someone who can operate a combine harvester.
• We may go extinct. If so, investments with a longer payback time than our timelines don’t make a whole lot of sense. “Live every day like it’s your last” might be relevant.
• We may reach a post-scarcity society, and property may or may not be maintained. Focus on resources you expect to be valuable even so.