Hi Bubs,
This is a hard one to answer.
From my own personal experience I disagree with the posters that say you have to be 100%/passionate/completely sure about moving to oz.
I think for me it was a case that I had got to a certain stage in my life and knew that if I didn't try it then I would always be wondering.
I am not an outgoing person but not shy either probably middle of the road, basically I don't mind my own company, so maybe that has helped me. Having said that I have made good friends over here and appreciate being with them.
I can't say I love oz but I don't get that yearning to live back in the Uk. What I would say to you though is if you have opportunities to change your lifestyle and move elsewhere in the Uk maybe it would be best to do that first.
Best Wishes.