So, I like these guys...advice?

I have the horrible habit of liking guys who like someone else, often my best friends.
So I really want to figure out if I have a chance with either of them, or just to see if their even interested.
Guys, is there a casual way to find out if a guy is...

interested? or that you can give them the hint that you are into them without making it too abrasive?
How do you act when you like a girl??
How do you tell when a girl likes you?

Ahaha, I just asked like a bagillion questions...pick and choose the ones you have an answer too. :D
Much Love<321

When your aorund them just seem very open and not guarded. when you do this they get more comfortable around you and might let you in on a little somtin' somtin'.
I don't know if this helps but there it is.