June 2013, never having been to Munich I found the forums useful and our transfer was without problem. We arrived at Terminal 2, you need to walk on the ground level to Terminal 1 section D E it is all well signed, this requires going outside for a short time from T2 past the Porsche and back inside in T1. Continue walking straight following the train ticket signs, past 2 sets of escalators to the platform and you will come to a manned ticket desk. Here English was no problem, I needed a one way ticket for two from the airport to city central (Hauptbahnhof is central station, Marienplatz is city centre) and we are staying 4 nights. The girl said immediately this is best, 2 weekly travel on all,bus, tram,s train and anywhere in the city zones and a one way for two. Total cost €48.40 which covered both of us.
She validated our tickets and pointed us to the platform, take any train and the trip will be approximately 35 minutes. It was very easy and has proved excellent for us. Hope this is of some help.