I just found a brilliant metaphor in an article about programmers vs designers, here's the relevant quote:
...a mistake we sometimes make as UX Designers is that we believe, if the race starts at wireframing, we will win.
This looks like a new and unflattering lens through which to view my self-image. If I have good math skills but poor understanding of customers, then I'm smugly confident about winning "if the race starts at rigorous problem formulation". But of course the universe isn't so obliging, and the race always starts before you'd hoped it would! If you feel blocked today, can it be because you're an expert at some task but poor at its natural complementary tasks?