A professional counselor or therapist can help an adult with ADHD learn how to organize his or her life with tools such as:

• Keeping routines
• Making lists for different tasks and activities
• Using a calendar for scheduling events
• Using reminder notes
• Assigning a special place for keys, bills, and paperwork
• Breaking down large tasks into more manageable, smaller steps so that completing each part of the task provides a sense of accomplishment.

Source: NIMH