I wonder how far people have gotten. For me:
5b) fur 6a) natyr 6b) natyvn 7b) nqnz 8a) cebqhpg
5b) fur 6a) natyr 6b) natyvn 7b) nqnz 8a) cebqhpg
Edit: by "8a", I mean the puzzle that leads to 8a ("get out your notepad")
I guess that's it. And fun times were had by all.