When you are traveling in Japan using domestic flights, sometimes it is necessary to transfer from one airport to the other, in the Tokyo area. This article explains the method of using the limousine bus to transfer from Haneda Airport to Narita Airport.
You will first need to purchase tickets at the ticketing machines on the 1st floor (there will be choices in language). You can also purchase them at the information counter right next to the machines.
You can pay by either cash or credit card.
Once you receive your tickets, head to bus station #7.
The bus ride is roughly about an hour without traffic.
If you are traveling the other way around (Narita to Haneda), you can purchase limousine bus tickets at the designated counters.