It's hard to give a tutorial for something requiring dexterity and patience. Like when my kindergarten teacher would tell me to only color between the lines. Some badges can be sprayed and the high points sanded but this really only works on more simple designs and risks wearing down the embossing before you can get the painting right. I brush on water based acrylic urethane airbrush paint. I remove paint from embossing with an xacto knife and fine hobby q-tips dipped in denatured alcohol. Then I put down a bleed check layer and clear coat of choice over that.
That's the method I used for this.