We moved to Greece July 2009 (this year) took us 2 years to plan, and was very expensive (for us as we had no equity or capital)
Getting a job to pay the bills is near on impossible, not because of work but the rates of pay do not cover costs of bills.
So running your own business would have to be somewhat successful, I am lucky (or unlucky if you like) to be able to commute to UK to work, so we have a decent income to live from as rent and utilities are cheaper.
We are in our 40's and wouldn't change what we have done as our quality of life is so much better.
If I can offer any info please email or post here, I can only say if you dont have children and you are in your 30's then go for it!