Trust your gut feeling. Go with your instincts. It's hard to give you some direct rules that'll always work because it doesn't work like that. Every person wants something different, so some like people to be eager and some are more turned on by the whole indifferent thing.

It's not easy, least of all because you get emtionally involved. But hey, if you're coming off as too eager the person will probably tell you about it - or if they don't, you're sure to eventually find out yourself. I don't know.. I guess what I'm trying to say is that no matter what happens it's a learning experience. You learn as you get more experienced.