While I don't have a build along, the last bow I did had lots of various size knots in it. The belly isn't your problem, the back is, assuming you are talking Osage. I take off the white sap wood and try to get it down to within a ring of the one I will chase, but I don't cut too much off right around the knot. So you will initially end up with your bow taken down to near the final ring but with knot islands with lots of excess wood left on. When you can see your ring, then you can start scraping it off the knot. It can be tedious, and you will have to scrape in many directions. Just be careful.