It's hard, I know - and I took classes as well, and my teacher told me to relax, not to try too hard ( very difficult thing to do). I was trying to meander, and it just looked awful! I let the whole thing go completely and focused on what I do know how to do Later I went back with a large mug of tea, some good music with gentle rythms, and just went for it. It did work then! The moment I start to "think" it goes wrong. Try some incense, relaxing music, anything to get you "in the mood" and try again, without any expectations. Perhaps that would help?