Hmmm well having about 10 friends and counting having done it I can tell you this.
1. Hide your weed.
2. Don't plan on ever having chicks over.
3. Don't mind sharing a 5 by 10 foot room with a very grimy person.
4. That herpes rumor is true.
5. The smell of dozens of grimers + snowboard gear stank + zero hygiene is a smell you don't actually get used to after a while.
6. Good luck!