Jenni,
Sorry you've had some bad experiences in the past. We all have, and it sucks. Just concentrate first seeing if there's some chemistry with your blind date. If not, move on. If so, be friends, then just have fun with her. Some girls advocate telling a potential partner right up front. I don't. I think a month or two is minimum (I waited six months with my fianceé).
Good luck, and relax.
