Now what?

So now that Deuce canters from my seat I've really been questioning my aids for all the other movements to make sure they are still consistent. I realized that I've never fully understood how to use my seat aids correctly. I've read that the basic concept is that when you put your weight towards one side, the horse will step underneath your weight to regain balance. I guess when I drop my hip at the trot, it makes him want to regain balance by stepping under with his hindleg. This makes a canter depart easy to accomplish for him. I still have questions about the seat though because now might want to canter when I just want a leg yield or shoulder-in, bend in the corner or later do half pass. I need to figure out the exact aids that I should be using for each movement.

Questions i have:
- Half pass and canter depart seem to have the same aids. How does the horse distinguish between them?
- I started just having even seat bones in the corner and bend the horse with my leg. Is this correct?
- What are the aids for shoulder-in? I've done shoulder in but now I'm realizing that it involves the inside seat bone. How can I help Deuce figure out whether I want shoulder in or canter?

I also need to work on getting Deuce to relax during the sitting trot. I think he resists my aids by being tense in the sitting trot. I'm sure this stems from when I used to ask for the canter from the sitting trot and then get tense when he didn't strike off right away.

Was Deuce's day off today. Will ride tommorow and hope for the best! I want to practice lengthenings and mediums so we will see how Deuce feels.