How to grow some balls?

[Albert]

Ok.
Here's the thing. There's this guy, Ewan, who I really like. I'm gay. Ewan might be attracted to me too. To quote one Y! Answer:
"Honestly, the best thing to do (in my opinion) would be to go up to him face-to-face and ask him if he's attracted to you. Speculation does NOTHING. It really seems to me that he is in fact attracted to you. If not, then this Ewan guy just sounds like a big closet case."
I was going to give Ewan a letter that says how I feel but another Y! Answerer said I should grow some balls and just go and ask him in person. No :stupid letters".
But how could I do this? The only time I'd be able to ask him is during or before class. People would hear and while they accept me being gay, I wouldn't want to make anything awkward for him. And how do I work up the courage?
Should I stick to the letter or what? Please help.

Thanks