+1 on making the dremel stationary with a solid base. SOLID is a relative term, since your not going to put much pressure on the attachement anyway...
Whether your using the stone attachments or the sandpaper attachments (I prefer the latter) you should tape the edge AS WELL as the whole blade face up to just a few mm within the area your working on. You could catch a runner of a trace line if you slip. Finish the tippy tip by hand with stones for best result, I have not tried otherwise...
Once more your going to finish with wet-dry sandpaper to your desired polish level, I go to around 4-600. It isn't important to me on a working knife other than for comfort, so on many pieces I leave nearly all (save 2-3" for pinch) the original "sharp" edges on the spine if they came that way from the factory. They are good for scaling many types of fish in my region (Northeast Striped bass, blackfish, sea bass, various flounders etc.). My point is your going to finish with spaper so you get a smooth transition angle wise, as well as feel/polish. Why wet-dry? It lasts a LONG time, you rinse it often and it CUTS FAST and reuse again and again.... Value wise and performance wise it is better stuff.
My dremel is 15 years old, variable speed top of the line in its year model still runs like a TOP and has done some heavy work in its life. Buy a GOOD one, and it will last a while. I dont know if they make them now like the older ones, but I can't speak higher of it. This past year I bought a bunch of sets of things to experiment with my aging tool, and It has shown its value years over.
JC