Do not open pack prior to pitching; that is a major contamination risk in the meantime, and it is not necessary. Place the pack on a counter top or table, with your fingers work the nutrient pack to the corner of the smack pack. Put one palm over it, place you other hand on top of that hand like you are going to start compressions, then press down with your palm keeping the nutrient pack toward the corner with your fingers. That should do it. After if pops, shake it up. Sterilize the scissors and the outside of the pack before cutting an pitching on brew day. You can do it!