To simulate walking down a hill bang the toe of the boot on the ground or against a wall. Your toe shouldn't hit the front of the boot too easily. If it does, either your boot is too small or your laces aren't snug enough. Your boots should feel a little big. Wear your boots around the house and in the yard before you go on a long hike.
Many people also wear different sock combinations when hiking.
Try different thicknesses, but always use at least two pairs of socks. Clean your boots after a hike. The grit in boots can abrade the leather. Grease your boots often. This will not only help keep them waterproof but it also makes you clean your boots every once in a while.