If anyone in NSW is "thinking" about doing this, don't be scared ( nervous excitement is expected though ).
There are Beginner & Intermediate groups / sessions for the Sydney Motorsport Park Track Days, and at the start, the hosts give you 2 way radios and do 2 slow siting laps in a convoy to show you the track and walk you through technique. There are also people there who will hop in the car with you to help you get the most out of your time on the track safely ( just ask ).
NOTE: I don't work for them or get anything for saying all this but I was just really impressed at how it was run and I had so much fun.
The last time I went out on this track was 11 years ago and they've improved the experience / service a lot since then ( however I now drive a bit more conservatively than I did 11 years ago ).
I went out in the intermediate group and was joined by the likes of a 1 series BMW, $600K Porsche (something), 5.0 Mustangs, Honda's, a WRW and an angry Fiat 500 Arbath on Semi-Slicks.
You soon learn who's going to be in your mirrors and just let them go by ( then try to catch them

).
You can drive as fast as you feel comfortable and so long as you keep your eyes open and follow the rules, you'll be fine. Yes, there are always people faster than you but it's not a race. Just a place to drive your stinger the way you wish you always could. No traffic lights, intersections, Police, Mobile Speed Camera's, etc etc.