I did it a few months ago. The only other thing I would add to lospilotos' post is a GCAA Licence Verification Letter- if you've already registered on the GCAA site (probably when you got your medical) you can apply for it through there- it's free and takes about 2 weeks to process.
I think it cost around EUR295 (mine is IAA/EASA now) and will be a 777/787 rating limited to A6- registrations only (until a check on approved device with approved examiner).