I did an ATPL course in Victoria, mind you it was a few years ago... whilst I did pass a couple of the exams first time after the completion of the courses, there were still a few that I needed to resit (I had gone quite poorly on them). After self studying the notes from Advanced Flight Training in Marochydore, I passed the remainder of the exams, whilst working full full full time.
I also had a colleague study using these notes and passed all of the exams SELF STUDY!!! So it can be done, and if you need help with any of the subjects you can contact AFT and also attend the courses that you need at some point in the future...
If I was you, I'd look into AFT and find out what all of your options are with them
