If you are flying QF out of LHR, then you won't be turning left unless you have a First Class seat. Business Classes are held on the upper deck or zone B downstairs.
But you will get the new Skybeds, so make sure you enjoy them. I found the massage function was good.
The first thing I normally do upon boarding in J (appart from look for an FA with a tray of bubble stuff

) is to seek out the entertainment giude and plan which movies I am wanting to watch. Note that you don't get a message saying they are starting (bring on the AVOD!) so keep checking. If the movies have not yet started, the system drops you back to the main menu. Keep an eye on everyone else for when they are starting to watch a movie.
Breakfast will be via a pre-order card like a hotel roomservice breakfast. Fill it in before you eat the first meal, because after the meal you will be full and might under-order for breakfast 9 hours later

. Hand it back to an FA as they walk past.
Don't be frightened to ask for something you want. If they are service coffee and you would prefer a port or Baileys or similar, just say so (even at breakfast time

). Don't be scared to wander into the galley and seek out the chockies on offer. And there is always water available in the galley.
Enjoy!