First off, howdy and welcome to the forum
It's not really possible to learn how to ride without actually riding. In that respect, riding a horse is a lot like doing open heart surgery. You can read all the books you want and watch all the videos in the world, but actually doing
it is a whole other ball game.
You can learn the ideas and the reasonings behind certain methods/movements, but there is a lot of muscle memory and reaction memory that must be built up through performance. It's not really like riding a motorcycle, where it will react the exact same way as the one you saw in the video. Because horses are their own thinking beings, handling them well takes a lot of practice.
Heck, I've been handling/riding horses for about 25 years and I still don't know everything I need to handle every situation that comes up.