Most teachers will strongly recommend you draw, draw, draw on paper to practice . Fill a sketchbook (use big, cheap tablets). You have to build muscle memory and that only comes with repetition. I say all this as one who was on the verge of giving up, too, nit long ago. Then I started on solid color sandwiches, and now I am getting the hang of it and ....drumroll please... really liking it.
You can do this!