hi luke
i have worked as a bouncer as i have to agree with marky, its all about the way you stand and the way you look ( and i dont mean dress sence) . you should stand tall, chin up and always keep your hands in front of you, that way you can use your hands to protect your self if the need arises also what we were told was you should always keep a tug at arms lenght away, (is your personal space), and talk over them be firm but not aggressive, you should always stay calm dont let them wind you up,
you can always tell us any thing on here, we will always listen
i hope this helps good luck jason