You just have to stop it on your own will. It won't be a Cinderella transformation, you won't learn it overnight; however if you remind yourself to stop doing it while drawing, you will eventually break away out of that habit. One of the reasons the course utilizes pen instead of pencil was to get out of the perfectionist mindset, to remove the ability to erase and try to do it better. Don't worry about it, try to do better for the next drawing, and move on when you mess up. The exercises in lesson 1 will help you make better lines, make sure you are doing your warmups before doing other drawings. A lot if it is just muscle memory, you'll get a feel for it eventually after a lot of practice.

"Inaccurate" lines could be from the lack of preparation before making the line. I catch myself all the time when I make line and realized I did not ghost before hand which led me to overshoot or accidentally lead off-course far away from the intended destination. Wobbly lines can come from hesitating or drawing from hand/elbow, make sure to not go slow when making lines and imagine each line is a samurai making a swift clean cut through bamboo. Uncomfortable has a comic on it.

https://drawabox.com/comic/1

Make sure to go over lesson 0 and 1's text and videos again because they go over these topics in better detail.