I plan to add a fence to my backyard, and am thinking to go to Home
Depot to get them to install the fence as well as purchasing the fence
from there.

If I get Home Depot to install the fence, are the installer or
contractor?
What values does a fence contractor add to the work?

Normally how do people go about adding a fence to their backyard? I
had already contacted the town to get a permit, but how do I find (or
decide on) a contractor and where to buy the fence.

Thanks