Re ScooterGirls original question.
I notice no one appears to have mentioned the GWABR route profile that was posted on Friday night. http://www.bv.com.au/inform.php?a=5&b=143&c=319
If I interpret these correctly, I don't know that I would worry about hills. For the last rides I have done I didn't go overboard training on hills and I survived. In training I just tended to push it where ever I went did the kms, used the gears and kept spinning. After the trip in to Cromwell in NZ I'd be more worried about any head winds than hills.
For interest sake If I get time I would like to overlay the last ride profiles on top of each other to show the difference.