Right so here's the deal.
I met this girl a couple weeks back, I'm in my college years in the UK (16-18 yrs). I'd defo say she's a HB9, her friends are also within that high band aswell. I managed to get her number through social networks, my mate has a gathering /piss up last weekend that she came to, put a slight shift in but didn't want to ruin it all too early so there was no kiss close to anything along those lines. She's invited me and my mates to her place for another piss up, probably 10 guys and 10 girls, her parents are away for a week so she said we could stay the night and whatever . So. My question. How do I escalate from just regular conversations to more of a flirty, sexual approach, but WITHOUT getting turned down which would make the entire night awkward and unfulfilling? I don't want to make a move and then find out that she doesn't want that and turns me down? She seems fairly game, and she wouldn't text me if she didn't want to talk but I need to make THE perfect move since I've never got with a girl this attractive.....EVER. Any tips on how to escalate and to check whether she'd be fine with taking it further, maybe even techniques that you have used in the past to get her upstairs and into bed? She seems fairly into me but I need a way of knowing whether she would go further than we are now? Any advice would be appreciated, would LOVE for this to go the right way for me.

Peace

Stop focusing on her looks. They're irrelevant and all they're doing is psyching you out.

Treat her like any other girl.

Kino is the answer. Touch lots.

Start with Arm touching
Move to leg touching
Put your hand on the small of her back while you're walking with her
Escalate this to holding her hand
Escalate that to kissing
Escalate further after that.

If she's cool with each of these steps, proceed to the next...

Don't say you like her. Show her you like her (i'm serious - don't verbally communicate interest, ever).