If the situation has come down to the point where you think you have to volunteer how you feel in order to salvage the relationship - then the relationship wasn't going to make it anyway. If girls like you, they wonder, and ask how you feel. Then you can tell them if you want. If they don't ask, and the relationship isn't going th eway it's supposed to - telling her how you feel isn't going to fix that IF you're being obvious enough with your actions.
It's worth mentioning that I almost always tell I girl that I like her during the first conversation - or the first date. I want to show her that I'm being open and honest with her, and she should do the same. It's not a sappy "I dream about you every night" deal. It's just "Hey I really like you, you're beautiful AND intellegent, a rare mix nowa' days."
As far as girls giving advice, it could go either way. Some girls give terrible "spill your guts" type of advice, while others tell you to play games. But there ARE some that give good advice, some even better than the men on this board. You just have to keep your eyes open.
-Blitz