Once the opener is complete, you have to gain rapport. When trying to persuade people using NLP or SS, I believe this is one of most important steps.
Rapport is creating a close connection or affinity with the person(s) you are in contact with. This will help immensely when trying to persuade the individual. Rapport can be achieved thru various methods :

1) The 'Hi' routine. Continually and unassumingly say 'hi' to people. This breaks down barriers and forms an almost instant rapport. Since you are not invading their personal space and it is a societal norm to return greetings, it is an easy way to create a general feelings of familiarity. JF

2) Eliciting Values or Trance words. Eliciting values is probably the easiest non-pattern approach to NLP/SS. By asking a series of questions about the person, you discover which words they lean on (these are called trance words - because they mimic exactly how the person feels) and repeat them back in a new and interesting way. The conversation that leads up to this is called 'Fluff Talk'. It is a method of getting the Values from a regular conversation. If after a few exchanges you do not get the VALUES you need - ask MORE specific questions that DO NOT REQUIRE a yes/no answer.

Example:
Me : So what did you do today? Anything interesting?
Her : Well, I went shopping, but didn't get anything.
Me : Why?
Her : It is so hard to shop and not buy. But I am saving for a vacation.
Me : Where are you going?
Her : Cancun!
Me : What do you like the best about vacationing?
Her : I love to get away, do my own thing - get away from work. I love the beach - I can almost feel the waves!
Me : Isn't it great when you have the FREEDOM to do and FEEL whatever you want. I love getting away, running down the beach and jumping into the waves. Doesn't that feel great?
(Values Elicited : independance, freedom, discipline) also she is Kinesthetic (feel the waves) work with words that echo this.

3) Pacing Reality. Pacing reality is very important because it causes the subject to agree with you because you are offering verifiable observations. You pick readily observable images/feelings/sounds and link them one after another. Theoretically, if the first thing you say is true and the second thing is true - then the last one should be true as well. JF

Example:
Girl sitting in a coffee shop. Say hi and sit down beside her.
Me (sitting down) : "Isn't it great when you can sit down after a long day, relax in a great place, have a coffee and talk to someone wonderful, even if you just met him?'

4) Mirroring. Mirror is the process where you mimic the other person in some physical/mental way which creates rapport. It can be sublte or it can be obvious. If you mirror properly, you in turn can be the leader and she will begin to follow you cues. Mirroring can be :

Sitting the same way
Blinking at roughly the same time
Holding you hands (and things in your hands) the same way - coffee cups, books
Brushing your hair back
Rubbing your face
Breathing

Mirroring is very important because it creates a bond (of sorts) between two people. The definition of Mirroring should not be taken too literally. Mirroring is creating a rapport with a person by showing you are somewhat like them - in a way, it fools them into thinking you have alot in common. Just like echoing back trance words, the unconscious mind picks it up, but if done right - the conscious does not. So when you are mirroring a girl (or anybody) - try to pay attention to the process - not the content (RJ). If the girl is speaking excitedly, mirror that - you also talk excitedly. But here is where the process comes in : do what you have to do without worrying if it is exact. Let the situation dictate the amount of sameness you need to mirror. It might be just some general mirror-like gestures or posture, it might be breathing and blinking, but it might be just a general attitude. Try not to get caught up in whether you mirror her right and left or your right and left. The situation will dictate what to do, but mostly do what you feel is the most natural. The unconscious mind is brilliant. It will not discriminate that you are scratching you nose with your left hand, but she is using her right. It will worry about the scratching ** the process **.

5) General be a friendly open person. Nothing creates rapport better than being yourself - friendly and personable to everyone.