Given that this was my first time in Paris and first time through CDG airport, I was a bit concerned about my ability to easily access the metro. In reality, the only hard part was the 45 minutes I had to wait in line to clear passport control. Once in the main terminal, the signs were large and frequent. The metro was very fast and not too crowded (compared to those in Istanbul). Trains ran every 8 minutes and the trip from the airport to the Notre Dame station took only about 20 minutes.