You would be sitting in your apartment. You just got a package delivered. It's a ritual set, the ritual you got was one that'll summon a version of you that's the other gender, it came all set up, all you need to do in order to summon your opposite is listen to the VHS tape's instructions.

The tape starts to play and sounds staticy before it becomes clear.

Tape: "Once you have all things done, prick your finge and let some blood dip onto the mirror. Within the next minute, your opposite will be summoned."