As Restore Balance resolves, first the player whose turn it is chooses the appropriate number of lands they control, then each other player in turn order does the same knowing the choices made before them. Then all the lands that weren't chosen are sacrificed at the same time. Then, starting with the player whose turn it is again, each player chooses the appropriate number of creatures they control, then sacrifice their other creatures after all choices have been made. Finally, players choose cards in hand without revealing them in the same order and discard the remaining cards.