Learning to draft clothing patterns can be very intimidating at first. There are pages and pages of instructions to read, such as with Devere's manual, or it can be full of points to draft out, such as with a coat pattern. It might be a good idea to start learning to draft by creating a woman's skirt draft. They have fewer points to draft, and fewer things can go wrong. I came across an article featuring three different methods of drafting a skirt by A. H. Scriven, from the Sartorial Gazette, August 1915. I like the part where the author states, "A school child, with a little knowledge of geometry, can both draft them and understand how the result is arrived at."