@thomasfuchs never been diagnosed with ADHD, but I really struggle with this. I bought a cheap non smartwatch that has built in timers for 1,3,5,10,15, and 30 minutes. If I know I need to do something and can't get myself going I pick a time (often just 3 or 5 minutes) and tell myself I only have to work on it that long, and set the timer
Usually, I end up finishing it, or at least getting it started enough so that coming back to it isn't as big a block