I, personally, do not believe the lectures are entirely important as much of the information is simply read from the slides themselves. This is just a reflection of last semester so it may not be representative of the semester that you are undertaking this subject in. Simply reading the lecture slides, alongside reading the relevant chapter in your textbook and completing the electronic tutorials until you fully understand the legal concepts, in my opinion, is enough. Also, if you completed legal studies in VCE, by all means, do not worry too much about the first few weeks of lectures as they are a basically Legal Studies 101.
Although it may differ from person to person, I did not attend the last few weeks of lectures at all and learnt from the electronic tutorials and the source book quite efficiently, scoring a final H1 grade. If you have a decent memory, I think you should be fine, so long as you are willing to work.