I just started learning this technique as well. The hardest part is getting the hands synced up; so what I did was learn some classical songs on the keyboard and applied it to the guitar: tapping the bass parts with my left hand and thoroughly practicing tapping the melody with my right hand. It's hard but don't get discouraged; one can do anything with enough practice. Check out some Chris Broderick; he does some really great 8 finger tapping you can learn from.
I currently have a pattern like this I'm practising;


I think the best way to learn this would be to practise the tapped notes first, then slowly add in the left hand notes.
guthrie govan does some 8 finger, in his second book he has a whole section on it
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