I like Tyler D's points, of course they require practice, but almust everything in this world require that.
Set of rules and law's just like Taylers are important because, IF you have somekind of communication handicap (if u r shy or something else) and you are not so good to enter in contact with other people, you know the usually quiet guy who always are alone, you people do understand that telling this person to behave like a man (somebody plz give me a definition about bein a man) a be yourself it's like SPITTING him right in his face.
A set of law and rules instead teach him how to act and behave with other people, in the beginning he will fake (pretending he know all the stuff) but later when he practised thise rules enough then he can be spontaneus.
But not before!
I dont agree on all the rules, just like the hand movements, im part italian, and I am born and growt up in italy, and belive me we use a lot hand movements when we speak. They are a support to our verbal communication.
Maybe because Italy for centuries was divided by small city states and every city state developed theyr own dialect (the italian language are the non-vulgar Florentinian dialect). Perhaps when people travelled they used a lot the hand motions in the effort to overcome all the communication problems.
So Tylers advice about hand movements IMO at least for me are useless!
Anyway all this advice has of course to be integrated in your personalities....so it is fluid and looks natural.