I like to start with a strip of bacon, to grease everything up inside the grinder. Then poke the meat in one piece at a time. Adding a piece of bacon after several strips of beef until everything is ground into large bowl. Be careful of fingers and neckties, you don't want that in the beef.
Note-- Air bubbles tend to form inside the grinder causing meat to fly. I use the saran wrap on the end of the grinder is to keep the meat off my walls. Held in place with a rubber band.