1) Learn to accept the fact that you are not a "normal" person. Society has changed quite a bit from the Beverly Hills scene to the "I Love Geeks" scene. Even though they have the T-Shirt, the arm warmer and the shoelaces, don't believe what you read. These people have NO idea what it means to be a geek. So, don't think that you will be accepted because of this.
2)You must be very familiar with public humiliation to the point that you really don't care anymore. TIP:At an Anime convention people think it's funny and not out of the norm if you can skillfully humiliate yourself (or others) in public.
3)You must have some kind of persecution complex. This is what brings us all together. It is our bond.
4)Now to the Anime part...Find your obsession and ramble about it endlessly to anyone who can decently pretend to listen. Be sure to choose a character to worship (making a web shrine will give you points).
5) If you have chosen to worship Inu Yasha or Sesshomaru....TRY AGAIN, you will get it right someday.
6)Owning an entire Manga series is a sign of high status. You must be sure to remind people of it, never let anyone forget your status (By the way, I own all of Planet Ladder, Angelic Layer, Cowboy Bebop "Shooting Star", Pet Shop of Horrors and Chobits.
7)You must Cosplay, but not as Inu Yasha. In this case it will be okay to dress as Sesshomaru, but only because a good costume(although rare) is harder to make. Be sure to choose a character that you can pull of physically, or you are just kidding yourself.
8)One of the most important steps is to WATCH THE CLASSICS!!! Ninja Scroll, Akira(this movie is the "Huckleberry Finn" of all Anime, it sucks, but you must watch), Dragon Half, Ghost in the Shell and Princess Mononoke.
9)True otaku prefer Subs over Dubs. If you love Inu Yasha and you don't know what I'm talking about when I mention Subs and Dubs, then my point has been made.
10)LARP(Live Action RolePlay) at least thrice in your life.
11)Play a few video games, get obsessed with at least one. PC games are acceptable and sometimes more prefered.
12)Last, but not least, remember this saying, "Anime, crack is cheaper."