All depends on your past experience too. If youve been around people some of the material will be presented naturally. Ive had years of retail experience and customer service, so reciting canned lines is no problem. Most of the time(not all the time unfortunately) my frame is strong and solid, I can deliver even dumb ass openers like..."Where the hell is your funny bone? Whyd anyone call it that?" (used this just yesterday on a drunk cougar) lol.
I'd say practice in front of a mirror. Or practice your openers / delivery / body language on a female friend thats sympathetic to your cause. It'll help big time. Plus you may even get a pivot out of it.
JUSTINcredible!
"easy there miss eye twitch, you kinda freakin me out."