I have the opposite learning going on now: I could always do a backbend (I call them that because I learned it in little-kid tumbling and then gymnastics rather than yoga) and learned to do a headstand on my own at, oh, 9 or so. So I don't really remember not being able to do them. Now I don't, though, and it turns out that I no longer have the back flexibility for a backbend, and while I can still kick up to a handstand, it hurts my wrists too much. (I can still do a headstand, though.) So to continue your practice metaphor, stuff happens because you keep doing hard things long enough to learn the knack of it, and then in many cases it keeps happening only because you keep practicing that knack.
(Not that that would help the wrist issue, though. Sometimes you just accrue injuries.)