Now I will cover more details on this. Okay first of all pendulum and message boards meant for combining with pendulum use are the best way to go. One on one conversation is pretty big deal in the spiritual world. That being said being able to communicate with the Gods is not limited to only a select few. They want you to talk to them. Treat them like a person you respect and of course tall to them with respect. From my personal experience, I started out very formal with the Gods I currently speak to on a regular bases. After a few days I began to be very comfortable talking with them having a two way conversation through my pendulum and message board with them.
You say how do you know its them? Because of how they respond and the feeling I get when I talk to them. That massive powerful vibration the pendulum gives off as we chat is the first sign that I'm really talking to them. The second is their responses. The way they respond to questions and comments. For Diana she has a very gentle and nurturing personality. Arcadia has a big sister like connection. Hestia is like a friend who always has great advice when dealing with friends and family. Lucifer is like a cool uncle who naturally has good taste. And Yeheshua is like a fatherly type who also holds a strong friendly bond and has a very calm energy every time I speak with Him. And then there's The mysterious Volcan. What a guy! He isn't as bad as the legends say. It takes a lot to get him mad. But when you do look out!
I am in the process of getting to know each god from each pantheon better because I want to get to know them. Its a lot of fun.