Women will tell you a lot with their body language and words. I will approach random women from time to time, but i usually use a technique i call "zero rejection factor"

This technique is applied to eliminate any potential rejections. What i will do ( in any situation...ie bar/club/grocery store/library...park etc.) I will create eye contact by either walking right into them or walking by them, ensuring eye contact , then gesturing with a smile or something. I will then move just slightly out of their direct line of site( staying within their peripheral vision)

As I move slightly more out of their line of site, i am watching them, looking for any conscious or unconscious gesture towards me. ie- a look over, as in where is he going. ( women tend to check out men ONLY when they know they are not looking at them, by staying slightly out of their direct line of site, you can catch them trying to sneak a peek) If i get the appropriate glance/gesture...I will then repeat the process and move to another spot. After successfully doing this 3 times, I will then approach knowing there was some sort of interest or attraction.

This leaves me without any approach anxiety or fear and allows me to approach with confidence. The rest will be totally up to the woman. I will be polite in my approach and try to engage her in conversation.

Here is the thing, not every woman is going to be interested in you. A true Pick up artist knows this and will deal with the situation accordingly. If you remain polite throughout your attempt, and read the body language and words of the woman, you can eliminate any potential embarrassment.

You want to keep it friendly and wait for the signs, if you come on strong at first odds are you will get a strong defensive response.

Basic positive signs include: her giving you complete eye contact as you speak.
laughter and smiling
subtle touches, arm, hand, leg
head tilting
body facing you

Basic negative signs include: looking away as speak/ or during silence
arms crossed
feet pointed away from you
short answers

These are some of the things you look for before attempting the actual seduction.

Generally if you are getting more negative tells then positive, it is wise to keep it short /sweet and move on.

By using this technique it allows you to get out of there fast while still not getting physically rejected. ( allowing your confidence to remain intact)

If all signs are positive, then work your magic, be funny, be witty, the best of it all is you will be confident and confidence is half the battle.

No, but I am a guy, not a girl. Girls are always getting hit on by guys, so they are always suspecting it. Girls don't usually go up and approach random guys, so there is no reason for me to suspect it.

So,for minimal risks I think this guy's approach is helpful, with girls close to your attractiveness level (he's like an 8-9 on looks)

I simply meant that attractive women tend to be attracted physically by either well built or good looking men, so they will give them more attention. As an aspiring PUA, you will need to be very observant of the signals women give you, so as you say, some attractive women will be drawn to you, but most won't, because they get hot guys to hit on them more often and they are used to that caliber of men (they have an abundance of aesthetically superior specimens at their disposal and so even if 90% of them are jerks, they will still give them IOI's in the perspective of finding the elusive 10%), and generally avoid giving them out to lesser specimens). In libraries you might get better response from women, because they might expect you to be intellectual, which many do like, but is not always apparent by looks in a shopping mall for example (nerdy looking is still too much though).