I sharpen cabinet scrapers as detailed in Hunting the Osage Bow by Dean Torges. I learned how on my first selfbow and never looked back. Goosenecks are a little more challenging due to their shape, but certainly doable. Same process. Mine are about due to be sharpened again.
Sometimes, if they're not too bad you can get away with just rolling the hook again, but other times that doesn't work and you have to perfectly square the edges again on stones, burnish/polish them in, then roll the hook. Still only takes about 10-15 minutes. But true happiness is a freshly sharpened scraper running down an osage bow... or better yet, yew! I just love it.
I use an actual burnisher also, with a drop or two of light oil. In cross section, it's sort of tear drop shaped, with one edge thicker and more rounded than the other. The thinner edge rolls a slightly bigger hook with less pressure.