Zazzy let me be the first to say welcome to the land down under! (I'm in Syd)
As for the topic.
I started out 3 1/2 years ago working with a company just with basic knowledge of Linux (IT though for 4 1/2 years) . Over the years I was there I learnt Solaris pretty good for self taught on the job. When I left there I didn't have enough experience to be classed as a Snr Unix admin (About 1-2yrs off) and I had too much to be classed as a Jnr
so wasn't to much going for me. I did however knock back jobs as I wasn't willing to travel interstate right now.
Anyway I'm now a Technical Consultant
Make me sound smart doesn't it heehee. I work cross platforma nd I'll be working on getting certs just to help me get a Unix admin role, not as a Jnr though.
But what I'm getting to is I'm working in IT, it's easy for me to move around I've worked on jobs/contracts that give me a good range of skills. Making it easy to move. I would suggest that you just go for a helpdesk/entry level role if your not in IT already! The hardest thing is breaking into the IT world. Once your in it's pretty easy if you're will to do some hard yards
Other people make differ from what I'm about to say. Though most people I know who work a *nix system know Windows, MAC, networking, Backups, hardware, programming etc. For me to know just Unix can't be done, Unix just helps make you shine in what you do best. Unix is the tool that makes everything run smoothly as it is a smooth O/S itself.