For an entry up the CL turning left at C
As you come up the CL keep focused on a point ahead of you (not at the Letter C) as you start coming up to the G half halt just enough to let your horse know you are preparing for something.
Keep the contact with the outside rein so that you can control the speed and the amount of bend you want to create. Don't give to much with the rein as you will loose your softness and the horse will fall in on the shoulder.
Back this rein up with your outside leg, position it behind the girth to stop the quarters swinging out but not so far back that you interfere with the action.
Your inside rein, you need to ask for inside bend as you approach G, with the help of your inside leg on the girth. This will enable your horse to flex but by using your other rein and leg you contol when the horse actually takes the bend.
You horse should at G be going forwards straight with a slight flexion to the left then as you give slightly more with the outside rein and ask for the impulsion to be maintained your horse should take the bend smoothly and not loose rhythm.
Horses have a tendency to slow down when being asked as they are not sure what they need to do but as long as you use your seat and legs that will help to produce a good bend.
Keep yourself upright don't fold in like a motorbike, instead learn to keep your shoulders parallel to the horses. Look to the direction you are riding and not down at the horse (I always look down, gotta stop that)
Practice on cirlces doing counter flexion go straight (on the circle)then flex in the right direction. This helps your horse to learn the aids, helps you to recognise when to give them and to learn the feel and footfalls of the horse. It strengthens neck muscles and helps the horse to become more supple throught he neck and body.
ALF