First start with a good specimen! Skin it completely, even down in the wings. Get all meat out of wings. Then clean the skin, all fat has to be removed. Then bathe in Dawn Dishwashing liquid x2, completely rinse, rinse and then rinse again. Paint artificial beak and preserve the feet while the skin is drip drying. Dry with a blow dryer. Then preserve with Borax and mount. Sounds easy right? Yea right. There are many steps that I am missing. Wiring wings and feet, painting feet, sewing, etc.
BTW I have near 7 hours in just the beak on this one!!!! But it is for a competition that I didn't make it to.