A little more detail for you if you want to do it yourself:
Jack up and safely support the front of the car.
Remove the big plastic splash shield that'* attached to the front crossmember under the front of the car. Most of the fasteners will be 10mm.
Remove the negative battery cable (5/16") and push it away so it can't touch the battery.
Remove the plastic cover (*) from the bottom of the bell housing and up around the starter (More 10mm bolts - wiggle and twist to get it out)
Unbolt the electrical connectors on the starter.
Remove the two vertical bolts that hold the starter up (15 mm?)
Drop the starter out (May have to twist and turn a bit.)
Make careful note of any shims that were used.
Clean the area where the starter contacts the engine/bellhousing (Starter ground connection is made there and it draws lots of current.)
Install the new starter with the same thickness of shims you removed.
Series II engines: Some cheap, rebuilt starters come with through-bolts that are too long - if yours extend more than 1/4" on the passenger end, you will need to cut the excess off the top bolt to clear the knock sensor.
Re-do the electrical connections.
Try the starter before lowering the car.
If the starter binds, or makes a loud noise, add shims until it sounds normal.
Re-install the splash shield(*)