The Basics

If I've said it once I've said it a thousand times, the key is confidence - making that first step of walking over to a girl is half of the battle won! Below are the 4 key things to remember, I intend to discuss a lot of these in more detail as time progresses but these should get you started.

Confidence
In no way can I teach you to be confident, however I can try and help you deal with what's causing you to be nervous; There are usually four main reasons for this :
1 - She's out of Your League. Firstly there's no such thing as leagues or ratings - you can easily go from an 8 to a 4 in the space of 15 minutes and you may find it took more effort to get with the 4. Girls can't be predicted and the "out of my league" excuse isn't real - better to try and fail than to have never tried at all (and after all if you pull a 9 it's well worth the rejections that may precede her!)
2 - They Might Say No! So what?? Rejection and failure is part of life, the sooner you learn to deal with it the better, cliches are over used but there really are plenty more fish in the sea - nobody has a 100% success rate, I certainly don't
3 - They're in a relationship... If you don't ask you'll never know - and even if they are in a relationship sometimes these things have a way of working out, although I don't advise being a home-wrecker sometimes it just happens...
4 - I'll look like a dick. Once again this is pretty irrelevant, you'll look much more of a dick if you're in the corner scared to go over - if you act reasonably normal girls won't reject you brutally. Go over and try and grope them then it might go slightly awry...

Know Your Enemies and Allies
There are two main groups in this case - divided conveniently by gender, we'll start with our male compatriots. If you're out as a group the role of a wing-man should never be under-rated - I've played the card and it's invaluable, especially if you're trying to get with foreign girls and they speak the language - it never fails. The complete opposite of the wing-man is the "cock-blocker", these people aren't necessarily tools, there's a fairly high percentage they're friends our partners of the girl you're trying to pull - don't get aggressive just out-do them at everything they do, until you get bored at which point give up. Usually I say don't give up but in this game you need to know when to quit!
Moving onto females - believe it or not there are some groups who want their friends to pull - either she's on the rebound or just plain bored. Countless times I've been out with female friends and pulled their friends - it won't harm your friendship with them and more often than not it works out quite nicely. However, for the most part girls don't want their friends to get with you - especially if they're drunk; I've worked in bars for years and the amount of girls who try to stop pulling is unbelievable, and in many ways quite impressive. The best way to deal with annoying friends is a) to use a wing man or b) to be a gentleman; if you come across as a really nice guy then the likelihood is the girls who are trying to stop you may well help you!!

Drink (The Double Edged Sword of Pulling)
Drunk girls are easier girls than those who are sober - for the purpose of this you should both be drunk otherwise society frowns on this somewhat! On the plus side you're far more confident and outgoing, and they're much more willing to talk to you - and much much easier. However you may make a complete tit of yourself - having groped a girls boob (accidentally, probably) and then been slapped drinking can make you into a complete tool. There are further issues with drinking because it's more than likely you get with people you shouldn't - ex-girlfriends or fat girls are prime examples of this issue - there's nothing worse than thinking you've slept with a seven and waking up to find a four!

Where to Pull
The natural hunting ground should be bars, pubs and clubs. Although if Wedding Crashers taught me anything it's go to weddings - personally I've not tried it but watch this space. If you can dance then you're in luck, I can't dance to save my life but I am exceptionally good and making a fool of myself when dancing - in a good way. If you can master this then you're onto a winner - my hint would be mime (work the ride on lawnmower - "Sixty percent of the time, it works every time..."). Within a club the main dance-floor is the most tempting place to go - but this is an amateur error, if you work in the smaller rooms there's a higher female:male ratio - and a lot more room. You also won't end up sweating and looking like a mess - looking good isn't that important, not looking terrible is...