1) Don't do anything that doesn't have her consent. 2) "Yes means yes" is a better slogan than "no means no." 3) Always be conscious of whether she seems comfortable or not and whether she's enjoying herself. This can be tricky, but always, always err on the side of caution. If she seems merely bored or uninterested, you should consider that a no.

That's really all you need. That and volume: if someone isn't interested, don't take it personally and don't force it. Just move onto someone else. Most pairings aren't meant to happen. If you follow my earlier advice and take care of yourself, it will pretty much automatically.