Use the tape measure to determine how long you want your finished mask chain to be. Drape the tape measure around your neck. The ends should be a few inches below your chin, but not so low that your mask will touch the table edge when hanging.
Use scissors to cut a piece of the bead stringing wire about 6 inches longer than you want your finished mask chain to be.
Thread one end of the wire through the small hold on the lobster clasp. Fold over about 2 inches of it.
At the opposite end of the wire, thread one of the crimp beads and pull it all the way to the other end, next to the lobster clasp. Thread the short tail of the folded end of the wire through the crimp bead.
Make sure that the two parts of the wire are parallel and not twisted. Put the crimp bead in the outer groove of the crimping tool and squeeze. Then put the crimp bead in the next inner groove of the crimping tool and squeeze. Rotate the chain 90°, put the bead in the outer groove again and squeeze to round off the crimp bead.
Use the needle nose plier to pick up a crimp bead cover. Place the cover around the crimp bead, and use the plier to gently squeeze the cover until the two halves meet.
Arrange the beads on the bead design board in the pattern you wish. Or, lay the beads on a towel with the tape measure along the edge to the length you wish. If you are using diffuser beads, place them high enough up so that the beads will lay on your skin, not your shirt. (For me, this was about 4 inches up from each end of the 20 inch long chain.)
Thread the beads onto the wire.
Thread the other crimp bead after the last decorative bead.
Thread the end of the wire through the small hole in the second lobster clasp and fold the wire over. Thread the tail of the wire back through the crimp bead.
Use the crimping tool to squeeze the crimp bead the same way you did in step 5.
Add the crimp bead cover using the pliers.
Thread the tail of the wire back through the first few beads, then trim the excess with scissors.