Step 1 is the same in either situation. You try to get a (free) boarding group for the Rat virtual queue.But won't opening and Genie coming online be just a matter of days apart? We are at Epcot on Oct 8th, just trying to figure out what the strategy will be then.
If you're successful, great.
If you're unsuccessful and Genie hasn't launched yet, you're out of luck.
If you're unsuccessful and Genie has launched, you can pay for an Individual Attraction Selection.