What you need: round nose pliers, chain nose pliers, cutters, a 20 or 22 ga. and 3-4" headpin depending on size of focal bead, 2 saucer beads (got mine at artbeads.com ) or bicone Swarovski's which fit snugly in the hole, a bail of your choice and a focal bead. If the hole is unusually large you can use seed beads that fit in hole to make the hole smaller and stabilize your headpin, as shown below.
Add a saucer or crystal to your headpin and string the seed beads on the headpin the length of your focal bead. Remember you only need to add the seed beads if you feel the hole is unusually large and you'd like to stabilize the headpin so it doesn't wobble.
Change the direction of the pliers in this step to vertical. Now you can commence to do the loop. Take the end of the wire and come over the top of the pliers to create the beginning of your loop, see below.
After you've created the beginning of your loop change the direction of the pliers again to horizontal and wrap the wire around the pliers until it looks like the following picture.
Your doing great, almost done.
At this point add your bail to the wire.
With your left hand, hold the loop you've created with a chain nose pliers. With a round nose pliers grab the tip of the wire and wrap the wire until it is snug with the saucer bead. Cut any remaining wire.
Do some practice runs with inexpensive wire like copper, brass or colored wire. You'll soon be doing this without even thinking.
HOPE THIS TUTORIAL WAS HELPFUL.
Note: This is my personal choice/preference for wrapping my beads. There are other ways of wrapping wire that can be used.