Every client has a "Care" plan which clearly states your duties. I would suggest that upon your first visit, request it from the client and then sit down and discuss it's content with them. This practice will also allow you to assess the amount of their day to day they can be involved in to help maintain their level of independence. This way, there will be a clear understanding as to what you will do, when you will do it and for whom you will be doing it for! Best of luck in your career choice:redpinkhe