It's certainly a bucket list trip and probably the only time (although never say never) I will fly long haul in F. I will be like a kid in a candy shop. I might ring up and see if I can get the MEL-SYD leg moved to an earlier time.
The only other way I could fly F long haul is upgrade from J for the return leg DFW-SYD using points (I have about 80,000 QF points). I'm guessing the 'lounge' in DFW is not comparable to the F lounge in Sydney.
Appreciate everyone's comments here. But it's definitely an exciting trip for me. What may seem like a mundane experience to some, will be something new and very, very exciting for me.