Before beginning this tutorial, I suggest you to refer to “Be a pro at dot-to-dot mastering straight lines”
HOW DO I DO 25 CM STRAIGHT LINES
this step is called “ghost drawing”
Breath out when you trace the line
After mastering A4 paper length, get ready for the A3 paper, 42cm in length !
Try it and let me know of your results in the below comment box.