I think it might be already too difficult. I'm running on OS X 10.8.4, and I set up an Ubuntu OS in VMWare Fusion. It's running around 600-700 ops, has gone through almost 80,000 blocks in 24 hours, and there's nothing produced so far. I'll let it keep running for a few days. I understand that luck is a major factor, so maybe lady luck will visit me.