Easy dude. Talk to EVERY cute girl there, you'll probably get rejected a lot, but you're bound to find mutual interest from a couple of them (if you're not an ugly fuck)
When you find one you're having nice conversation with, & you find out she's single, claim her for the night.
I typically use something like "okay, you know what? You're gonna be my buddy for the night" or some shit like that.
So you can go around & keep talking to other people, but give this girl constant attention.
If she's drinking at the party, go ahead & try the kiss once she's faded enough. Make sure you're always touching her when you're around, too. I like to tell girls "hey give me a hug" or "hey I want another hug" the physical stuff is important if you wanna get in some panties.
either way, once the party starts dying & the people begin slowly leaving, tell the girl "hey, my house is down the street, you wanna kick it after the party?" And if she says yes, you'll probably fuck that night. If you've done everything I said & she says no, then you must be an ugly fuck or she got curfew or some dumb shit. Anyways, post results after the party
YOU HAVE TO THINK ABOUT THIS FOR A SECOND.
this is a solid plan for a bar or whatever. but OP is going to a house party. most ppl there are going to be ppl you know, or ppl someone you know, knows...
here's a solid plan for the OP in 4 steps:
1) find the "visitor".
hopefully there are some random girls or really distantly connected girls that you won't see ever hear about again.
2) isolate her from her friends.
this one is tricky and where wing-men are most appreciated. girls run in packs at parties and they will always try to leave together. you gotta distract her friends with your friends.
3) privately hook up with her at the party.
you gotta start early if you wanna bring her home. the chances of her leaving with you to finish something is much higher than the chances of her leaving with you to start something.
4) have an easy/quick way to get to your bed.
you two will probably be pretty drunk, so make sure she doesn't get sick, pass out, or have time to reconsider.
if you fuck up any of these steps, then you have to go to emergency protocol*.
*EMERGENCY PROTOCOL: host the after-party at your place.
invite the girl, her friends, and your friends to your place for an after-party. repreat steps 2 - 3.