Getting bogged, breaking down, getting injured etc can be deadly in the oz bush if you're on your own.
I've gone out in the oz bush a lot in one vehicle, but always with a mate. I've broken down once (busted suspension component) that required getting back to the highway (little honda 50cc minibike in the back of the 4wd - we take 2 of them) about 30 miles away. Then hitching a lift to the nearest town (100 miles away), getting replacement part, hitching a lift back, driving back to the 4wd on the minibike. Quite the adventure that took nearly 2 days out of our trip. Mate stayed with the 4wd and worked on getting it jacked up and ready for the replacement part. The key was keeping calm, taking it easy, taking it safe, knowing we had plenty of food/water and alternate transportation to get back to help.
Anyhow, not directly an answer to your question, but something to consider beyond the simple "getting bogged" issue.
Bare minimum gear I'd take would be a full size shovel, a decent jack, highlift/baseplate etc AND spots on the vehicle that it can be used on. Be able to deflate/re-inflate the tyres. Be ready to hike to get wood etc to put under the tyres after you've jacked the vehicle up. Decent mud terrain tyres. Brain engaged before putting vehicle in gear....
Eventually you'll get tired of the de-bogging b/s and get a decent winch, extension cables and think about recovery options (trees etc) that may not be available before hitting the bog
Diff locks will also help a lot.
Momentum will get you a long way - maybe too far....
Once you get stuck and start digging down, get off the pedal fast before you're down to the chassis.
Worst stuck ever was on the edge of a salt lake. Took ~4 hours of digging and dragging wood/shrubs from a mile or two away - nothing much lives around a salt lake - especially one named "Lake Disappointment"

Took us 1 minute to get stuck (2 vehicle lengths into the lake) and 4 hours to get the vehicle unstuck (moving it back 2 vehicle lengths)...
Finally, sounds like you need to find some mates with 4wds and go have some fun together and learn what works for you and what doesn't. Learn the capabilities of your rig and how it is setup and learn to read the terrain so to not attempt the really stupid (well not too often at least). When unsure, it doesn't hurt to get out on foot and take a stick and do some soil tests - easier to get your feet a little muddy versus your entire body
cheers,
george.