Viper,
Up to this point, I've had a very high opinion of you. Your love of cars, in particular the greatest sports car ever made, has made me like you a great deal. But, all that will change if you chicken out on this and don't do anything concerning this wonder woman. I'm dead serious. You
have to do something about it! I can speak from experience: I was at a party one time, and I met a really great girl who was exceeding, painfully hot and best of all seemed to like me back. However, I hesitated as I was not sure what I wanted to do about/with her. I liked her lots, don't get me wrong. But, what happened was that since I waited, she assumed that I didn't like her or something. So she, being a very desirable person, easily found another guy who she is now going out with. That was maybe 2 months ago, so the pain is still fresh and I am still kicking myself for not asking her out in the first place when, as I found out later, she would've said yes!
Now, I can't speak for certain on whether or not this Goddess-on-Earth likes you or not, but I can (and will

) say this:
If you don't make some sort of advance on what could possibly be the best thing to fall into your life, I will personally hunt you down and castrate you with a dull spoon.
Don't take that the wrong way, but you must, without a doubt, do something about this woman. Not to mention that even if it doesn't work out, you always have Sarah to fall back on. I mean, she said herself she wants to date others. You should too!
Now, as for you not having experience: Don't worry about it. As someone else said, you just have to be confident in yourself, be yourself, and just go with the flow of things. If things go smoothly and you find yourself in a position where you "experience" might be handy, you should just confide in the girl that you don't have much experience. You'd be amazed how much women are taken with the fact they have a novice on their hands. She can teach you exactly what SHE likes and she'll love it. Not to mention the fact you opened up to her about something (she'll presume at least) you don't tell anybody, she'll feel closer to you and you'll have a special bond. Do it. It works. Trust me on this Viper.
Now,
GO GET 'EM TIGER!