Question: I'm flying to Frankfurt, Germany and must travel to Trier by train. Is that difficult to do. I don't speak any German. Also you have to change trains.
No, it is not difficult to do. Trains leave right from the airport, although you will need to make one and possibly two changes of train. Don't worry, all the ticket agents are likely to speak English, if by chance not, they will get someone who does. Most of the conductors can speak some English as well.
See more responses on your other two posts. How to Look Up Train Schedules Online gives you the DB train schedule link and tips for using it. The tour department also should be sending you pretty specific advice to reach your hotel.
Here's Rick's wonderful video with basic "how to take trains in Europe" information: http://tinyurl.com/ac82c92