As an RPCV (returned Peace Corps Volunteer) who completed 2 very rewarding years teaching English overseas, I would say:
- Be patient during the application process. My application was approved in 3 months, but 6-18 months is actually more common.
- Set realistic expectations. Culture shock and, frankly, boredom, are two of the biggest challenges when living and functioning in another country. Do not expect that it will be a 2-year thrill ride!
- Take training seriously. The first 3 months in country are spent learning the local language and learning how to do your job properly. Pay attention, learn the language well, and heed the instructors' advice.
- Use your experience as a learning opportunity for people back home. Write letters, emails, Hubs (!) about your experience so others can learn valuable lessons from it, too.