I'm a younger gal and can do all the fence work myself.

All you need is something very sturdy like a post, one or two fence stretchers, some rope or wire, and a little muscle. I actually put some new fencing up the other day and tied the stretchers to the post with baling twine. Worked great.
Here's what I used. We used to have a better one that you could just run a metal rod through the wire and hook it to the one stretcher, but that went missing so I used one of these on the top and one on the bottom and stretched the wire as much as I could.