Hanging mirrors causes anxiety, and not just because they're heavy and delicate and you don't want the seven years of bad luck from breaking one. Positioned right, a mirror adds light to your dining room for a golden glow, but done wrong and you're staring at a chandelier glare or watching your dinner companions chew in the glass. Get it right the first time by taking the guesswork out of wall hangings for placement that works for you and accommodates your space.
Get a measuring tape and mark off 57 inches from the ground, on the wall where you plan to hang your mirror. Make a light pencil mark. This is "eye level" for average people.
Hold up your mirror so the center of the object hits the 57-inch mark. Ask a friend to hold the mirror for you, then step back and look at the mirror.
Notice how the sunlight passing through the room hits the mirror. Then turn on your dining room light to see if light glances off the mirror in a way that would hurt your eyes. Evaluate the mirror sitting and standing, to see how you like it.
Consider leaving at least 18 inches between the bottom of the mirror and the floor and at least 6 feet between the top of the mirror and the floor -- general mirror-hanging guidelines. If you hang your mirror too low, it can reflect your dining room table, knickknacks and other things.
Adjust the mirror slightly if you're hanging it behind a sideboard or other piece of furniture in your dining room, so that it's centered on that wall in position to the object.
Choose the position you like best after you've accounted for the furniture and the wall spacing. Get a second opinion from your friend, then pick the spot that looks best.