How do you get tips on having a crush on a girl that is your friend?

Crushes are a part of the sub teen and teenage social structure. If you are trying to figure out to handle yourself around her, you don't have to act any differently than you have before, just continue to be friends. I realise you have alot of feelings that might be unresolved, which might be driving you nuts, so its important that you and this girl have a talk and let her know how you feel. If that's too much pressure for you, write her a note and tell her. You may not know how she feels im return, and you may turn out to be pleasantly suprised. On the other hand, remember that the teenage years are very painful for most of us, and those feelings change quite quickly. The reason they are called crushes are because they hurt. Just be honest with this girl. Its better than keeping this to yourself and suffering in silence.