Hey! Way to go Strange! I'm proud of you for just balls out asking for her number. And look how it turned out! I hope you have called her by now and decided to at least meet for a chat somewhere. Good luck!
Oh and a little deprecating humor is OK, but you're right- don't go overboard. No more than 3 negative things said about yourself the whole date!! I mean it!! Just try to talk about her a lot, that should keep you safe.