As said above, life is too short for what if's, go for it!
Whether it's Austria or Australia you'll still find the process hard initially, as you will be starting from square 1 with everything. Chatting to mates of mine that have moved to Australia and New Zealand they tell me that you have to embrace the challenge of making new friends, building up your professional reputation again and finding a home (different to just finding somewhere to live). And whilst it's not easy and doesn't happen over night, like all things that take a bit of effort, they're very rewarding in the end.
3 of my friends stories:
1. In the UK, ex-army lorry driver. Lived in a 2 bed terrace house in Portsmouth. No family. Went to New Zealand with his girlfriend.
Moved to New Zealand 8 years ago, retrained in IT lives in a 4 bed detached bungalow with Orange trees in the garden. Drives a little sports car and a 4x4 pick up truck. Goes diving and fishing from his own boat, with his son. I've been to visit him once.
2. In the UK, ex-army electrician, owned his own electrical pumping company, married with 2 kids, lived in a 4 bed semi-detached in a village in Essex.
Moved to Australia 5 years ago, had to retrain as an electrician to get their qualifications, found it hard working for someone else, ended installing solar panels on various tropical islands, has settled in Brisbane and has now bought a house with a pool which is close enough to the beach that him and his son can carry their surf boards there. No has his own company again. I've promised to visit, but never have, yet.
3. In the UK, ex-army electrician, married with two kids, lived in the same town that he went to school in with his mother just around the corner.
Moved to Australia 6 years ago, initially went to Perth and then moved to Brisbane as he didn't feel happy there. Now has a nice big house with a few cars and seems happy, although I've now lost touch with him.
Whilst there seems to be a common theme of being ex-army don't read too much into that as a lot of my friends are. Although I suppose that you could suggest that because they are ex-army, failiure was not an option and they made it happen..?
Conversely my office manager here at work moved to Australia 6 or 7 years ago and was back in the UK within 6 weeks!
Good luck with whatever you choose, but then like most us here I'm sure you believe in making your own luck.