Guardianship for an incapacitated person shall be used only as is necessary to promote and protect the well-being of the person, shall be designed to encourage the development of maximum self-reliance and independence of the person, and shall be ordered only to the extent necessitated by the person's actual mental and physical limitations. An incapacitated person for whom a guardian has been appointed is not presumed to be incompetent and retains all legal and civil rights except those that have been expressly limited by court order or have been specifically granted to the guardian by the court.