Hey there! I wouldn't say it's that complicated, but it does have its challenges, hehe. What I would recommend is drawing contour lines on the cylinder. It's difficult to visualize the volume of a cylinder when you only have a flat shape. Adding contour lines will help you give it volume and, most importantly, indicate the direction of the cylinder. Take a look at the example on the right. The same shape can have two possible directions, which I indicated using contour lines. :) If you're having trouble figuring out the direction, you can use an arrow to indicate which way you want it to go. Hope this helps!