Oh wow! I used to do Calligraphy long ago. I just found my pens the other day cleaning out the craft box...
I learned in school about 7th grade I think... They put me in a special class for 'accidentally gifted' kids, lol. Anyway, the teacher was AWESOME and let US decide the different things we wanted to study. We did Calligraphy, Mythology, Geography and Archeology. It was a blast!
It really does improve your hand writing too.
It's not too difficult to learn, like Chevygirl said, practice and holding the pen at the right angle. Once you figure it out it's really easy! lol
The cool thing is there are so many pen and ink options now compared to when I was learning it. I just saw a website the other day that had so many lovely feather pens and beautiful ink colors. I need to go find that site again.....