My Zen master said that he had never heard of the word "ego" until he got to the States so in Zen circles I often hear that the ego is like some kind of enemy thing or something like that but I think "Who is it that practices? Who is it that takes Buddha vows? Who is it that takes Bodhisattva vows? Who is it that learns Dharma? And really now, who actually is it that is our authentic self?" to which I think Ego! so I would suggest that you don't go pushing your ego around, it just might be your Buddha.