Hi Louise,
Just wanted to welcome you to PIO.
Sorry cant really help with any of your questions, but just wanted to extend the hand of friendship and say "hello" from another plastering family!!
Think you may struggle to fit any of the TRA criteria at present - if you check out
www.[URL="http://www.workplace.gov.au"]workplace.gov.au - Home[/url] this is the TRA website, follow links for skilled workers and then check out the Uniform Assessment Criteria - at present you have to prove formal qualifications/training (they withdrew the pathway that allowed assessments purely on experience in September 2007). They are currently reviewing all the pathways and a decision is expected at some stage - indications at the moment appear to be "sometime before July" (hopefully for you, and many others here, it will be a lot sooner).
Hope you get the other answers you are looking for, someone here is bound to know!!
Good luck