I did hours, and hours and hours, and then more hours of no stirrup work. I used to be able to post without stirrups, I can’t anymore, as I was young then, but I still have my seat. My trainer was evil and made me jump without stirrups a lot, I hated him for it at the time, but love his memory now.
When I used to teach (just newbies, nothing advanced), I’d use the spray purple wound kote, and spray the area of the mane that they should grab mane at first, and then as they progressed, they would release hands to that same area.
I am a visual learner, so I also needed someone in the tack room pretending to be the horses mouth, and what my hands did in relation to the contact, to see the difference. For me, once I got it, I understood.