There is a good reason that you see so many hats embroidered and many visors screen printed. Visors are difficult to embroider. They can be done, however. Before beginning a visor project you need to know that they are not easy and embroidering one relies a lot on experimentation. The experimentation aspect of embroidering on visors makes it quite challenging for a beginner. Challenges include a small embroiderable area, the bill not being far enough away from the machine and no good way to stabilize the visor in the process. The options you try will depend on your embroidery machine.
Hoop the visor using the cap frame used specifically for your machine. If using a round attachment like the Brother 600 series uses, hoop the visor backwards on the frame without latching it into the clawed gripping strip. Secure the visor with clips provided with the hoop. If using a flat frame, prepare as you would with a cap, taking extra time to smooth out the embroiderable area onto the sticky stabilizer.
Attach the frame to the embroidery machine according to your machine's directions.
Turn the machine on.
Upload the desired embroidery design.
Size the design to fit within the visor's embroiderable area. Use the preview or trace options on your machine to double check that the design is within the proper area.
Thread the machine with appropriate threads.
Push the start button.
When the design has finished stitching, remove it from the machine and then from the hoop.
Using dense designs will increase the likelihood of the visor slipping. Keep the design simple and without heavy stitching. If you have an embroidery business, charge more for visors. Many embroiderers do because of the individual time involved with each one.
Never walk away from the machine while it is stitching a visor. Since the visor is often loose, it could slip completely and damage the cap or break your needle. Never keep your face close the machine while it is stitching a visor because if the needle hits the bill or frame, it can break and fly into your eye. Don't expect two visors to stitch out exactly alike. Each is an individual process.