I have been in a similar situation before and, not knowing how or why, I f***ed it up.

How should your first approach be like when you know through someone else (good info source) that this person is already into you?

I mean, that's about half of the job done, but I dont want to make the same mistakes as before (which I couldn't quite figure out what those mistakes were). I think because knowing what she felt like made me more nervous about having to do everything right because there's no way I can make things wrong if she already likes me.

Thanks in advance

Edit: in* advance