I think one of the biggest hurdles of getting diagnosed for me was that I knew exactly what I needed to do, but ADHD kept me from getting started.
edit: 37 years old and knew something was wrong my whole life and that it's probably adhd since my early 20s
First step is to start, though. Gathering tools, strategies, and new habits is a process that has to start somewhere. Easy said than done, of course, but even easier to ignore.