It's the strangest thing. I've been sticking to a daily meditation practice for over three years. There were even times when I didn't feel like a beginner -- few, but they did occur.
The I saw a book on the shelf at the local B&N. This one:
I picked it and started reading. I've since picked up four more. It really feels like I've spent that last three years in preparation for today. What was I doing? Perhaps this is beginners mind.