Hmmm, at the sitting trot maybe you should take one hand and hold it on the pommel of the saddle. Hold it so that you can feel the motion of the sitting trot, and when you are ready, let go, but try to stay in-sinc with the motion that you felt while holding the pommel. That worked for me when I learned to trot atleast. Also, you would get into the canter by putting your outside leg back. I remember my instructor would always say "Outside leg back and go!"
Don't worry, keep trying, it takes time. I remember, my first lesson my calves really hurt. Maybe you should try doing wall-sits to improve your leg muscle. Wall-sits are when you lean your back against the wall, and have your legs bent at a 90 degree angle. You sit there for as long as you can. After riding for 3 years, I can do this for several minutes. You'd be surprised, wall-sits are harder then they look!
Last edited by horsegirl123; 01-07-2009 at 08:06 PM.