Great Advice! Definitely helps to get eye contact first...as she's checkin u out if its longer than a second(She likes what she sees)....and then u won't have to deal with resistence. Now of course, some girls u get eye contact from will act disinterested to hide their true feelings(Deep down they're glad u approached them regardless as in their eyes, it makes them feel attractive) as most guys don't approach during the day or when there's a group or cold for that matter.
Now imagine a stuck up girl, she's probably stuck up because some guys who approached her didn't do it right, now imagine if she didn't get approached barely anymore/hit on...she'd freak out and would want to feel attractive again(A female's worst fear is to not be wanted)...but since we got the knowledge of how to approach a girl...we can do it successfully. Its what they want and will remember most.