It's weird but for me its the other way around. Once something is going, if executed properly, I find structure forms and you get slowly sucked into the moment

It's weird but for me its the other way around. Once something is going, if executed properly, I find structure forms and you get slowly sucked into the momentum. New problems and challenges are discovered and you can plan what the fixes are. Your strategy changes as you see the fruits of your labor turn a theory into something tangible. Milestones become clearer and you just want to drive forward to the next one. ...whereas starting (for me) is really hard. Sure I have a million startup ideas and I could just pick any one and run with it. But I know I'm not at a point in my career anymore where I can just hack away at something for shits and giggles and see what comes out of it. I know I have to pre-plan and test theories, examine size of addressable markets, look at the competition, etc... all to ensure the idea I run with is 'crap tested'. But at that point a) it is hard to find the drive to do the boring due-diligence and b) the long-term goal seems so far off it is hard to build those shorter milestones. So for me, I love jumping into a project that is slowly beginning to ramp up rather than sitting with a blank piece of paper and having to start.