Some ways I've tackled this: For hardware, don't even begin to build it until it's fully designed. That sucks the fantasy and freedom away. Build it to throw

Some ways I've tackled this: For hardware, don't even begin to build it until it's fully designed. That sucks the fantasy and freedom away. Build it to throw away. I built a boat, sailed it a few times, then abandoned it on the beach. That attitude helped me quickly make a useful thing not obsess over perfection. Have small milestones where it's OK to stop at. I have a few projects that are in service but nowhere near complete to my original fantasy. They're still useful enough.