The best is to get the cat to help you to push the gold in place
The next step is to burnish the area where you want the gold to be really bright and shiny with an agate stone burnisher, in this case the all mirror. Different agate shapes are required .
Then depending on the client, more or less ware on the high points, more or less bings and bangs, and more or less patina. For this client, a lot of ware and heavy patina.
Here are finally the final pictures. it does not do exactly justice to the mirror, there is more of a subtle shine on the gold surface.