Now slide the ring of the size you want for your particular stitch marker onto the head pin, and use the pliers to help you wrap the pin around itself above the beads.
For a more detailed look at how to do this, check out Tammy Powley's wire wrapping tutorial.
Make sure as you form that first wrap that the loop around the ring is loose enough that the beads can move freely around the ring -- this will make it easier to maneuver when you're using it with your knitting.
You can wrap as many times as you like, as you have room for or as many times as you can with the head pin length that is left. I like to try to use the whole length of the pin rather than cutting it, because it seems like the cut edge is sharper and more prone to snagging on my knitting.
If you choose to cut, use wire cutters. Either way, make sure that the end piece is as flat as possible against the work so it won't snag.
