1. Uh oh. It's happening. They're here.
2. Now what?
3. First of all: Don't freak out.
4. Seriously. DON'T. FREAK. OUT.
5. Keep a level head.
6. Keep a sharp eye out for ambushes.
7. Try to befriend the aliens.
8. If that doesn't work, find a secure hiding place.
9. Keep an eye out for people who are not who they seem.
10. Acquire basic weapon skills.
11. Learn hand-to-hand combat, just in case.
12. Organize a counterattack.
13. Disguise yourself.
14. Use that disguise to steal a vehicle.
15. ...until you can find a spacecraft and leave for a safer planet.
16. Congratulations. You just survived an alien invasion.
