The linked article is about learning for pleasure, but there are also challenges associated with trying to enter the field as a second career. The technical complexity, of course, and the scale of what needs to be learned, can sometimes be overwhelming. It helps to bring as much humility to the process as you can muster. But peoples' perceptions can also be a challenge - no one quite knows what to make of you!
I like to think it's an opportunity. If you're able to combine domain expertise from your first career with a solid grasp of CS fundamentals and a good day-to-day working knowledge of your toolchain, that can make you a pretty rare interdisciplinary candidate. Perhaps that then informs how you market yourself and to whom.
Best of luck to anyone coming at this as a second career!