Firstly read this
Fire Breathing
And this
an interview with pele
And all of these...
search threads 1
search threads 2
search threads 3
There are lots and lots of threads on
Fire Breathing, have a look through them using the search function at the top of the page.
Secondly, yes, that is all there is to it, but the risk is incredibly high, (read above article).
That is partly why
Fire Breathing is not considered particularly impressive within the fire community, as not that much skill is involved compared to other disciplines. (And of course, because its very dangerous).
That said, there is still some skill involved, and extensive practise with aspirating water should be carried out before going anywhere near fuel.
Your friend was lucky this time. But if he continues without learning how to do it properly, the chances are that he will not be so lucky in the future.
All it takes is a gust of wind, or a breath thats too early after the fire ball. Not to mention the long term risks of putting fuel in your mouth, especially as he hasn't used any barrier cream.