Check out the newbie mission on the forum, its actually really good. Haven't done it yet but I promised myself I will before uni ends.
the-newbie-mission-vt41556.html
I was out with my housemate yesterday and he had a hard time approaching a girl and running the opener we practiced. Eventually he did what Lovedrop calls a double take at a bar,approached a single set and was actually chatting her up for a bit. Point is, after that approach he just felt more confident because he actually approached a girl regardless of the outcome. So yes start with approaching randoms at day venues, but if you go out in bars and clubs, try running your opener 5 times every night. After the first 3, it just starts getting easier and easier!