As a General Contractor I must tell you that in NO WAY should you hire Home Depot, Lowes, Menards or the rest to do ANY actual installations or work. The people generally speaking that do work for the home centers are the proverbial Carp of the building trades. Anyone who is any good typically speaking (and there are a FEW exceptions) IS NOT doing work for Home Depot. Home Depot has gobbled the market share, filled their stores with people who haven't the first clue what they are talking about and many Contractors loath them, myself included.
That being said, figure approx. $4 per linear foot for installation only. So....if you have 225 linear feet (total footage) of fencing, figure about $900 for installation. Give or take a few bucks depending on a zillion factors like gas prices, local insurance costs etc. That figure comes from the Means 2005 Residential Remodeling and Repair Contractors Guide 2005.
If you want a fence that is straight, and installed by people who speak English, don't hire Home Depot.