Start your wrap, as snuggly as you can, I like wrapping with my fingers.
When you come to the end of the coil, use chain nose pliers or a pair of parallel jaw pliers (these work best) to crimp down your coil. With the balled ends, you can tuck them tight to the coil or bend them up over the coil for a design element. Have fun with it, the possibilities are endless.
Thank you and have a great day creating!