When the same rule is difficult, how should it be adjusted?

When the same rule is difficult, don't remove the rule—adjust how it's achieved. Breaking steps down, extending time, showing with pictures or a model, using tools, reducing the amount, or meeting the same goal by another method are all reasonable accommodations. The idea is to clarify what you want kept (the purpose) and prepare another route that reaches it. Share "same purpose, flexible method" with the teacher and convey it to the child in an understandable form.