Home decor is not just about furnishing your house with lots of pretties. Even the outside can be dressed up in a way that says "Welcome Home".  Domino Magazine has some great how to’s on installing a stylish doorknocker.

This DIY project is easy and our friends at Domino Magazine have spelled out some simple instructions for you to follow. Remember, it is very important that before following these instructions, you
look over the instructions that come with your doorknocker and make
sure that they are the same. Do not follow these instructions unless
they match the manufacturer’s.

Surface Mounting

1. Mark the mounting site.

Stand
outside the closed door and determine where you want to position the
knocker vertically (you’ll want to hang the door knocker between eye
and shoulder level). Then measure the door from side to side to find
its horizontal center. Use a pencil to mark your spot.

2. Place the knocker.

Surface-mount
knockers usually have two holes in them, through which you’ll insert
wood screws. Center the knocker on the X and use your pencil to mark
the two places where the screws will pierce the wood.

3. Start the screws.

Remove
the knocker from the door. Place the pointed tip of one screw on one of
the pierce spots; use a manual screwdriver to drive the screw one or
two turns into the wood. Unscrew it and repeat on the other spot. This
will make it easier to mount the door knocker just where you want it.

4. Install the door knocker.

Place
the knocker on the door, lining up its holes with those you’ve started
in the wood. One at a time, insert the screws into the starter divots
and turn with your screwdriver until they just hold. Adjust the knocker
so it sits where you want it. For an easy finish, use a power drill
with a screwdriver attachment to drive the screws into the door. Note: Slowly! Too fast and you could strip the screw-heads or mar your knocker’s finish.

Through-the-Door Mounting

1. Measure your door’s thickness.

Mounting
a doorknocker requires at least one all-thread bolt-the kind without a
head-that is ½" longer than the door is thick (a typical outside door
is 1¾" thick). If your doorknocker doesn’t include bolts, or if those
that come with it are too short, buy new ones from a hardware store. If
the bolts you have are too long, you can cut them to size using a
hacksaw.

          2. Mark the mounting site.

3. Drill your hole/s through the door.

Using a power drill with a bit slightly larger than the bolt/s, bore a
hole straight through the door at the place where you’ve marked. If
your knocker requires two bolts, drill the second hole as well.
Standing on a sturdy stepladder will help you hold the tool straight if
you’re drilling above eye level.

4. Install the doorknocker.

Once the latch is in place, attach the mounting plates.

1. Put
   the two short screws through the small holes in the exterior mounting
   plate. The head of the screws should be on the side of the mounting
   plate that will face away from the door. It says "Gainsborough
   Australia."
2. Attach the screw posts to these short screws on the opposite side of the mounting plate.
3. Thread the screw posts through the latch mechanism in the door. The exterior mounting plate should be flush with the door.
4. Hold
   the interior mounting plate against the inside of the door. Position it
   so the two small holes in the plate are aligned with the screw posts
   coming through the door.
5. Thread the long screws through the
   small holes in the mounting plate and into the screw posts. This will
   affix the interior and exterior mounting plates to the door.