Ignore your feelings of awkwardness. That's what I do when I talk to people I like.
Then again, it's hard not to talk to people I like since I'm a teenager and all the testosterone flowing through me makes me fall in love with pretty much everyone I talk to.
But really, if you only "sort of" had feelings for her, how hard can it be? Tell your friend how douchy he is and if you really think she's worth it, make your move on her.
Please ignore my advice, I've never been in a relationship