I broadly agree with this. The basic recipe is to try and hit a "flow" state as quickly as possible. You can do this by (1) getting rid of unwanted distractions, and (2) fully immersing yourself in the mindset of whatever it is you're doing, before actually tackling the hard work. One straightforward way of getting started on the latter if you're prone to getting distracted is to reread introductory material on your field, even if you're already familiar with it. Introductions are often light on cognitive load and written to be mildly engaging, so they're the closest thing there is to a "fun start".