I know most of you know this already but for the benefit of new pilots and students who simply pop in here for information:-
An ASIC is nothing to be worried about - it's not a big deal as long as you have a clean criminal record. There’s a bit of paperwork and a fee which, to my mind, is currently far too high. You need to take a photo with your phone/iPad and its all done online. You have to collect it from an Agent, in person, producing the original ID docs.
Now; it is perfectly possible to aviate around our great nation without an ASIC - some major airfields do not require one - e.g. Jandakot, Camden, Archerfield etc. But a lot of tiny airfields do require you to display your ASIC e.g. Coober Pedy, Bendigo, Quilpie etc. Sometimes it's about AVGAS availability - do you need? ERSA is your friend. If you look up an airfield and it states in Remarks that “This AD is a Security Controlled Airport” then you should have an ASIC when you head that way.
Upthread someone stated that they simply ignored the ARO when approached - maybe not a good idea. The AROs do understand and will help if you’ve simply just flown in for a wiz/avgas etc. My experience has always been that they are great people to deal with. However, be aware that Security Controlled Airports are being monitored by the AFP and they have to abide by the AFP protocols - even if it is Roma!
Also, a lot of places don’t display the gate code anymore. There might be a camera and they want see your ASIC before they give you the gate code - they maybe just can’t let you pass landside/airside even if you have a VH registered aircraft sitting at the bowser.
In summary, it's just not a big deal. You can plan around it, if you so wish, and even if you don’t have an ASIC, a little bit of decorum and simple common-sense will get you through everything except the major airports.