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In short: she must be not scared from you and she must have sense of slight control over you, so do everything you can to assure that she see you on that way.
First rule is to see that you are trust-able person.
That means that you are not some offender or abuser, that you may go out of here life easy if she don't like you or stay in her life if she likes you.
After reading your guide I started to experiment with locally chicks in pub and had 2 successful one night stands.
One og them told me that I am pig and another that I am great lover and that we should date.
You will easier hookup girl online, than in supermarket, but it is not impossible to act also in situations where you are very tight with time.