Start with your wooden letter.
Sand your letter with some sandpaper.
Paint your letter with your sage colored mineral paint, making sure that all your edges are covered.
Lay your letter on top of your decoupage paper and outline it with a pen.
Cut the shape out of your paper.
Paint mod podge on your wooden letter.
Stick your cut out paper on your wooden letter so that it sticks in the decoupage.
Use your transfer tool and make sure that it is flat and nicely stuck down.
Using sandpaper, sand the edges off.
Cover your paper with mod podge again.
Dry it with a heat dryer/hair dryer.