Then, once you digest that basic understanding it is addicting.  Especially to a person who admires the art form and it's expressions.  Once you're hooked you'll move on to other instructors/teachers.  It is good to mix it up as I have found no one teacher/instructor is good at all things ballet.  They focus on certain parts of the body.  Right now I take with two instructors at two different locations in different level classes.  I take beginner ballet at a local studio that serves the county I live in and I take intermediate ballet at a local college twice a week.  

The beginner class is great as it moves slowly and you get to go back to the basic movements at slower tempos to remind your body not to be sloppy and savor deep plies, lenthened tendus, accented degages, perfect your pas de bourres, study your turnout and so on.

The intermediate class challenges me.  I still am hit or miss on "zippering" my center so the barre work really pushes me as a lot of it is performed on releve'.  The center floor stuff is hit or miss for me as it moves so quickly it is difficult to pull up and engage all your core at one time.  Somedays I dance with impeccable clarity and others it just falls apart.  Silly it is.

But I can tell you, after playing some football in high school and other sports through my life, that ballet past the beginner level starts getting really challenging.   The intricate footwork, coordinated port de bras, pulling up your center, and working the proper muscles (yes, you use different muscles than you ever have before if you are doing ballet correctly and if your instructor is paying attention.  The muscles you use are completely different sets.  To contrast this, you also need to learn to relax, disengage, even lenthen, opposing muscles).  

Ballet is technically what it appears aesthetically: elongation, equilibrium, endurance and elevation.  It takes time and dedication to being with your body in ways similar to yoga and pilates that will help you open up.  IT takes time to get to a level that you enjoy what you are learning.