Each player (including you) reveals their hand to the player on their left, who chooses a card for them to discard.
Each player draws a card.
For quick resolution, everyone can give their hand to their left hand neighbor simultaneously to allow them to choose which card must be discarded, and then get all their cards handed back. If sequential timing is important, each player goes around clockwise starting with you, resolving that choice.
Apart from the two players involved, hands are not shown to any other players. Of course, the discarded cards will be visible to all.
All players, including you, draw one card after they have discarded.
This is not an Attack card.