It does take quite a while to get the "feel" for SR shaving, and "feel" is what I think applies. You can know and see what to do from any number of videos but you need repetition to develop the necessary coordination to guide the blade around your face. Start slow, you don't need to do your whole face with the straight, do the easy parts first and follow up with the DE until things start to come together.
For me it took two months before my son commented that he thought I was getting better at it. Not good mind you, just better. And I still have my DE handy.