Xantum,

Foreigners are not going to stay in Nepal forever. They are only vitising Nepal for a period of timeafter which they will come back to their countries. So, I rally do not think that they should be prepared for any differecne of culture. Just tell them to enjoy our beautful, unique, and diverse culture. Also, our culture is a friendly culture, which welcomes foreigners, and still has a lot of hospitality.

Thus, there is no need to get prepared for any thing; just tell them to relax, visit places, and make best use of their trip if they are planning to visit Nepal.

Hope this helps.