Slow to start, hard to complete, lose interest, can't get it perfect? These are some of the stresses of productivity and ADD. Having some tools to work through these challenges can help.
Know your strengths and work from your strengths. Have the best possible match for your work. Creativity, being in the moment, and being a people person are often strengths for people with ADD. Also an intense curiosity and love of information are common. Tedious, every day tasks are usually not. Whatever your strengths, capitalize on them in your work.
Create partnerships that work for you. It can include an administrative assistant, a colleague, or technology. The interaction with your partner will help you get started and the accountability will help you finish. Be sure to ask for help in addition if you need this from a professional organizer, an ADD coach or a productivity consultant.