i have a book recommendation but it isnt specifically about adhd its called drawing on the right side of the brain if anyone here is interested in learning to draw but also interested in learning a bit about how different regions of the brain work and how learning to draw relies more on using the right side of the brain etc its a very interesting read  also regarding your first point about spending too much time planning i can relate so much to this try using a timer try being stricter with yourself about the amount of time you spend it is helpful to think in terms of hour to hour and just be really strict with yourself adhd folk have a big big problem with prioritising i realised im doing it myself actually want to learn to draw so i am just reading a lot about it gotta find a balance between readingplanning or learning about something to actually doing it i can relate so much to this anyway hope youre doing alright x