Hi Emilyalice,
I have gone through the whole limited registration process and now I have full registration with AHPRA. So, in order to apply for limited registration, you need a job offer from a company first. Then your future employer and supervisor can help you sign all those tedious forms for limited registration application. The limited registration process usually takes 6 months according the the guideline of OTC. During the process you need to fill in supervision plan, supervision log, mid-way reports and final report. For my own situation, after I submitted the mid-way report (3 months after employment), they requested me to submit the final report straight away. So, I spent less then 6 months to get my full registration. During the job hunting, it is very important to emphasis that you are eligible for AHPRA registration otherwise it will be really hard to get a job offer which the employer is willing to do so much extra administration works for you during the limited registration application.
Good luck.