The primary use of our fence is to keep the dogs in. The tough old yeller dog ignores barbed wire and goes through between the strands, so we went with hog wire (goat wire, horse wire, all the same stuff as far as I can tell). The other dog is an adopted greyhound; if she gets out she probably couldn't find her way home, but on the other hand, a piece of dental floss would probably keep her timid soul from crossing.
The second use was to keep the 4-wheelers off the property until we started building; they were starting to tear the place up before we bought it. I didn't have the tractor yet, so I hired it done right after closing. Paid about $1.25/foot installed, plus a little more to clear the fence line, which I understand was a bargain, but it was a fellow who wanted to keep his crew busy until their busy season started. Had a little more than 1,600 feet installed.
I didn't have a gate installed (had access through my daughter's land), but now I'm going back and set up a recessed entry area and gate. I watched the guys do it, and I can handle it, now. They used the same stretching, bracing and stapling described above. I have to install some new corner H-braces right next to existing fence and secure the fence before cutting the hole and removing the small posts, otherwise it might go wild if I tried to cut it, it's stretched so tight.