One word of warning: if you're trained in engineering, technical drawing and the like, or if you have the facility to learn new skills from a book, you'll be fine. If, like me, your learning style is more monkey-see, monkey-do, then you might struggle. I needed two terms of evening class in pattern drafting to get my head around it sufficiently to follow the book I originally used, Natalie Bray's Dress Pattern Designing, which is from the 1950's and is properly techical.
In either event, if you are drafting for yourself you will need a 'fit buddy', someone who can tweak the fit with you because you can't easily see your own back view and twisting to try to see in a mirror moves everything around.