Remember that it's fine to have _really small_ next actions.
For example, I have a budgeting problem that I don't have the faintest idea how to solve. But I will need to have a particular email to solve it. And I'll need to be able to find that email when I work on the problem.
So my next action is - seriously - "Create a folder for X budget problem on laptop". And the one after that will be "Find Y's email and put in X budget problem folder." I'll probably still be lost, and the next one will be "Re-read Y's email." After a few more ittybitty next actions like this, I will probably eventually hit on something that makes greater than microscopic progress on the problem.