Once you've made a call correctly (balk, bi, ci, etc), it becomes so much easier to recognize and get right the next time. After a few times it will become part of your natural umpire vocabulary and no big deal. You will be perceiving more of the action taking place because your brain has a place to put it efficiently. That's how you grow.
Just be careful and only call things you can explain using rule language. Otherwise you may be accused of allowing the fans to call the game on a late call.