I agree with the probably best not to fake it crew here.
To super- I wouldn't reccomend completely faking it. It might be
dissapointing. Try getting into the industry at least for a little while
(bussing, serving, hosting, anything really), so you can at least understand
the dynamics of what really goes on. I started out as a hostess, then a
busser, then a server, then a bar back, and finally a tender. Hell, at one
point I even worked as a pastry chef! It's beneficial for you to know the ins
and outs of not only YOUR job (bartender), but the whole she-bang.
If you are dead set on wingin' it, best of luck to ya.