At first it'll seem overwhelming. Take a minute to drink a beer and stock up for the train ride. Once you get your mind set It'll be easy. Most Germans speak fluent english. You'll see the influx of Metalheads making there pilgrimage towards Wacken. Don't take a taxi. They charge too much. Take the number 110 bus in front of the airport to the Ohlsdorf train station. Catch the train in ohlsdorf heading towards Altona. From Altona you catch the train heading towards itzehoe. From Itzehoe take the Wacken shuttle to the fest. If you have questions, just ask the people at the service desk at the Hamburg airport. Ask them how to get to altona. To kill some time before the fest I suggest staying at the Reaperbahn or St. Pauli. You'll get a good mental trip. Just follow the Metalheads.