I wish I could learn this faster. I can't even count the number of things that I've procrastinated and burned hours or days of brain focus on avoiding that ended up taking 10 or 15 minutes to just accomplish once I finally started.
Having said that...I'm not diagnosed as ADHD but I definitely feel I exhibit executive dysfunction symptoms, and one of my siblings was diagnosed, so I'm feeling confident I'm ADHD adjacent at least...and just trying to implement Getting Things Done helped me immensely. Not only does it help with having a less stressful day (no longer do I have "what am I missing? what am I forgetting? Ahhh, angst!" feelings), it also helps me to just stay on task and/or when I switch tasks, know that I have the confidence to come back to wherever I was.