usually everyone will tell you to round em up. my first two breaks the edges were rounded , but the one that i have thats held together , i rounded the whole side , not just the edges of the sides. on a selfbow , youre probably going to have a bit of angle there still , but i'd say round em up really good.
dont go too fast sanding either. i skipped 150 grit and went from 80 to 220 , and i have scratches in some places. that will teach me to rush...
-hov