When showering, always face the drain. Not only will this help you avoid getting soap in your eyes, but it will also give you a chance to practice your "I'm a functioning member of society" facial expressions in the mirror.
Also, don't forget to wash your hair with the water running down, not up. This will help you achieve that perfect, "just-washed-my-hair-and-now-I'm-a-socialite" look.
And remember, if you're singing in the shower, make sure to warm up those vocal cords before belting out your favorite tunes.