One common failure mode of "do the smallest/easiest thing first" that the article didn't address was that sometimes it's so easy to "buy the running shoes" that you end up with a house full of "easy first steps." I think a better approach is to aim to eliminate unnecessary complexity in moving towards the goal. You can do this by aiming for the smallest, easiest, and simplest first step that simultaneously maximises progress towards the goal. e.g. "I want to make a stand to hold my XYZ." Bad first step: Buy a 3D printer. Good first step: Improvise something out of cardboard.