Just got the message that I got upgraded to J from Y+ on SYD-HND flight tomorrow, given this is my first J experience in long haul flight, anything I should do to take full advantage and make sure I don't look like a complete beginner? 
(I know this topic must have been posted many times, but only 24 hours to go and I still need to pack my bags, so haven't got a chance to search for old threads, feel free to link them to me)
For now I can only think of choosing meals online ahead of time, but can't select seats as all seats are already under airport control.
(I know this topic must have been posted many times, but only 24 hours to go and I still need to pack my bags, so haven't got a chance to search for old threads, feel free to link them to me)
For now I can only think of choosing meals online ahead of time, but can't select seats as all seats are already under airport control.

