If you want to learn to do something properly, you’re going to have to fuck up every once in a while. Mistakes are what teach us the right way to do something. Without them, we’d be under the impression that everything is perfect, even if it was far from.
Writing and drawing are both skills that take an exceptional amount of error and practice before they can be mastered. Unless you are lucky enough to have some sort of freaky innate savant talent, you’re going to screw up… a lot. The Celebrating Mistakes Pencil by Tom Wrigglesworth (imagine having a name like that in grade school) and Mat Robinson allows for as many errors as you can stomach, with plenty of eraser to spare.