I know nothing about navigating or PPL in Australia, but when doing PPL solo nav in the UK I found it useful to have a GPS on the back seat, recording my track. After the flight, at home, I plotted the track on my marked up chart. It was very revealing, and so soon after the flight I could still recognise every turn and wander.
My FI thought it useful too. It gave him feedback on my solo nav skills and I learned a lot discussing the tracks with him.
Even the cheapest hiking GPS will record tracks. Google "GPS mapping software" for ways to scan your chart and plot the track. It is a bit of a hassle but I thought it worthwhile.
Finally, you speak of overload. I can certainly sympathise with that, I was the same. In my case more practice meant better organisation and more time to navigate. Eventually!