I'd say put her out of your head when your not actually with her, until after you've shagged her. We've all made that mistake, and it just means you'll end up fantasizing about her non stop and feeling wick if you don't end up riding her. When your chatting be confident about everything, tease her lightly, try and like lead her through doors with your hand on her back and get her hi fiving you/other light touching things, cos if she doesn't feel your touch it'll make it more awkward if your going in for a kiss etc. when you know she likes you (chats to you a lot, smiles, you'll know) get her number and invite her round to watch a DVD or to the cinema or something.
If it gets to a stage she doesn't seem interested, just stop chatting to her or caring about her to avoid getting into a "friend zone" thing where you want to ride her and she teases you but never gives you any action. The best policy is not giving two ****s about her till after you've bucked her. That's my advice anyway!
Your post in the "Your type of girl" thread described a girl I know at college. I wouldn't say they are huge though, but any bigger and they would be. She's got a great sense of humour too, which for me is essential. We're new starters so we both stick together in a small group of other new starters. At the moment I'm playing it cool, I don't want to become "good friends" no going back from there, there's a guy in our group who is trying way too hard to pull her. She's confident and bubbly but if I take a break from teasing her and being nice to her she goes quite shy which I'm taking as a good sign. I'll keep you updated mate. Any words of encouragement ?