I suggest starting far away from the piece you want to paint with the can of spray paint. This will help it be more even with less paint lines. I then moved closer to finalize the coat. You’ll want to put the first coat on and check it before putting a second coat on 2-3 minutes later. You can do this for several coats. It will need to dry for 1 hour before you apply the poly coat. The poly coat will need to dry for 1 hour before you are able to touch and thus install the knobs.
Where does your jewelery currently hang out?