> "Till this moment I never knew myself." - Sense and Sensibility again? I can't remember off the dome. That's a gorgeous strict Iambic."Till this moment I" and "I never knew myself" would be trochaic and iambic, respectively, but they don't strictly scan when you overlay the 'I's. You can of course get them to by e.g. eliding 'moment', or adding a line break and taking '-ment' as a feminine ending, or just scanning according to the writer's idiosyncrasies.
And individual writers can be very idiosyncratic here. Shakespeare, for example, if I remember right, lets monosyllabic words occur in almost any position. Disyllabic words on the other hand can have any combination of stresses (iamb, trochee, spondee, or pyrrhic), but only if they're foot-aligned. And so on.
The field has probably evolved since I was last part of it, but I'll still recommend Kristin Hanson's work in this area: https://linguistica.sns.it/RdL/9.1/Hanson.pdf. (Actually the second time I've recommended Hanson on HN. The last time was, let's see, 6 years ago!)