for me, some kind of scrapper is imperative! i really think that without one you will have a MUCH harder time. I also agree on the rasps, i use a surform rasp and boy let me tell you, it takes off wood great for an easy fast way to remove wood! i would say its good for shaping the bow. Sandpaper and 0000 grit steel wool is important too, for board bows, since its not one ring, i sand the back until its smooth, then i use the steel wool. the reason for taking that step BEFORE the tillering is to avoid breakages because of a lifting splinter. if you back it that would solve your problem too. For me a band saw makes the profile really easy to make, so if you have one, GREAT! but if not, dont worry about it. I also think a rattail rasp is important too. you will probably want to make a tillering tree as well to help you see the limbs bending without pulling it yourself.