I can't think of a video showing the grinding of a new bevel.
1. Sharpie the edge and past the shoulder.
2. If you want to thin the knife (i.e. set a new lower angle bevel, reprofile, et al) make a few passes on a dry stone. What you're looking for in results here varies based on how much you want to thin the knife. A drastic thinning would equal just removing the Sharpie from the shoulder. A less drastic thinning would scratch the shoulder and part of the way down the existing bevel. How far down would equate into how much thinning. Further down toward the edge = less thinning. No matter how much you want to thin, the shoulder has to be moved up towards the spine in order to effectively thin the knife.
3. Once you've determined what angle that might be, stick with it throughout the coarsest grit stone you have until you've formed a burr on both sides.
4. Sharpie the edge once again. Make a few passes on a dry stone at the same angle. If the Sharpie is gone from the very edge to the new shoulder....you've done good.
5. If the Sharpie is not gone....you've done bad and must punish yourself with more grinding.