One very important technique for overcoming adult ADHD is Positive Visualization. For adults with ADHD years of negative outcomes and self-defeating thoughts build up to become giant roadblocks that lead to procrastination. When people with ADHD are confronted with negative or overwhelming thoughts about a project or task, it causes all other stimulus in the environment to become very distracting and even enticing. Often, people will find themselves doing things that they like even less than the task they need to be doing. For example, doing dishes or cleaning the bathroom, rather than sending a quick email to their boss.
One way to begin overcoming this, is to integrate Positive Visualization at the beginning or at the scheduled time to work on a given task or project. Positive Visualization involves thinking about the rewards that will come from completing the task. These may be things like material success, praise from others, or even intrinsic factors like the feeling of accomplishment. By doing this, it tends to excite the brain and bolster the production of dopamine, making it more likely that you will engage and complete the task.
This is just a brief overview of a very powerful tool for managing procrastination. There are more complex techniques to practice with this and bring about real change in your life. However, by starting with this very simple application, you will likely start to find some success.