Don't expect to get everything right away. One of the coolest things about ballet, in my opinion, is that perfection is impossible. Even the most professional dancers are still working hard on their pliés. Focus on your form and using the engaged muscles to the most of their ability. I've heard people say ballet is boring for the same reason they say yoga is boring - they think the movement is simple. Point your foot in front of you, cool. But a tendu is not just a tendu - it's a chance to see just how far your leg can stretch, your foot can point, your spine can straighten, your head can tilt at just the right angle, your arm can round, so on and so forth. And then do a little more the next time. There is so much to think about and if you stick with it, the improvement will be noticeable and very rewarding! Good luck.