a 5 based on 1 - 10. The area of difficulty is the highest in the areas of windows, doors, and the measuring of the roof "fall". Is this a hip roof or a "A" frame. "A" frame is easier than a hip roof, but hip is more attractive.
YOu should not have any problems at all, if you do, call in for us to assist you. Some one will promptly answer your posts.
How are you attaching the floor plate to the foundation? Did you insert those bolts into the concrete prior to drying? These are the best, if not, then drill your holes and set anchors, or do as I do and get a cheap Remington 22 nail gun and shoot them in.