Jim, routers can be quite dangerous, it takes some practice to get used to using one. To round over the edges on an oval properly, it should be done on a router table. It will take more than one pass with the bit, to get the complete round over cut. And to start the cut, you should have a guide pin in place for safeties sake. Plus, seeing as it's oak your thinking of using, be prepared to do some sanding, as there will be a few burn marks on the edges.
Len