Thought I'd share my positive experience with my latest OWA 280k booking - 16 flights, 34,987 miles. The Qantas call centre staff seem to cop some flak here, but not in my recent experience.
After researching and deciding on my flights, I spent 20 minutes on the phone to a particularly helpful and efficient consultant. The booking actually stumbled on my second last leg, seemingly due to an AY married segment issue. All the other flights were saved into their system while I went away and looked at the alternatives, then I phoned back a few hours later and was finalised in 10 minutes.
Apart form the usual advice of knowing the rules, researching flights, etc, on this occasion it seemed to help in efficiently waiving the phone booking fee (with no questions asked) by reporting the 'error code' that the online booking system seems to often throw up at the last stage.
Thanks to all on this site for the tips.