tncattle,there are lots of ways to stretch fence,I use a come along and clamps when I build fence, and a fence stretcher for patching fence.
Tie one end of your wire to your post,by makin at least a couple turns and twisting tight,take the other end to the other post wrap it around the post,take your come along with a clamp and attach it to the wire at the post,take the other end of the come along with clamp and attach it to the wire several feet from the post,as you can see,you have a half loop around your post and you can use the wire itself for a pull point,........pull tight,but not too tight ,staple the wire at post,let loose your come along and cut the wire to a length that will wrap your post,I like to untwist mine ,and remove the barbs,just wraps better and looks better,makes a neater wrap..............good luck
PS I use this same method for pipe posts,except I make a full wrap at the pull post and use an oil can to oil it as I pull,when its tight I use a 6 or 8 inch "C" clamp to hold the wire tight till I can cut and wrap.