Another important consideration at this point is your socks. Thin cheap socks will give you blisters during a long hike. A good pair of thick socks is recommended. Again your outdoor or camping shop can give you good advice on socks and can probably sell you what you need. Socks need to be considered at the same time as buying the shoes, this is because thick socks will increase your shoe size.
Thick socks are important for three reasons.
Firstly and most obviously they create extra padding for your feet, secondly they reduce the friction between the feet and the hiking boots and thirdly they wick away sweat from the feet. These characteristics are very important when it comes to blister prevention. Now that you have your hiking boots and high quality thick socks you need to wear the boots in. Under no circumstance buy a new pair of boots and go hiking in them for any distance the next day. Expect to wear them in over one or possibly two months of short walks.