Most of time I spend in practicing basics. A brutal amount of revision is needed.
For example you practiced horizontal line and you're good on it. Now try to learn straight line, and voila now your horizontal line is crooked. You practice horizontal again and make everything right, now you can learn vertical line. 80% time you're thinking like I can't do it, I'm not made for it, I shouldn't have tried. Every instructions is useless. Nothing matters anymore. But later you try and make it effortlessly. I don't know what happening, it feels like I have some strange power.
Learning a skill is such a pain, how as a kid I used to learn things. Perhaps I am old...
(useless rants from someone learning to draw manga)