* Use the corner to help set up the movement.
* Look in the direction you are travelling.
* If your horse is narrow you may need to ask for a greater angle, so that in a dressage test, the judge can see the shoulder-in.
* A horse with a large chest will give the illusion of shoulder-in with less angle.
* The rider should not lean in either direction but remain straight at all times.
* Push your inside leg forward as drawing it back pushes the quarters out which is not shoulder-in.
* Feel how lightly or strongly you need to apply the aids. For example, if the horse moves his quarters in too far then less outside leg is required.