How difficult is replacing a starter on the 2003 ford taurus

Did you check the starter relay?
It is separate from the starter motor

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This problem is caused by a defective starter solenoid, the solenoid is mounted to the top of the starter motor. Generally the best thing to do is just replace the starter with a rebuilt part.

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There are 2 nuts that secure the wires to the starter. Check to ensure that these nuts are tight.

not difficult at all. a couple of electrical connections and a couple of bolts and your done. the hardest part would be working under the car. go to autozone.com for free repair guides and specific info on how to replace your starter. remember to disconnect the negative battery terminal first

depending on the quality of starter, the price could range from $150.00 to $300.00

since this is a front wheel drive car i wouldnt really advise doing this by yourself unless youv done stuff like that before. I would say its not so much difficult as it is tedious work and requires some time to complete.

The starter solenoid is attached to the starter unlike the older Fords. You will have to remove the splash guard to gain access to the starter. It is located on the front side of the motor.

If you can verify that the battery is good then I would say that the starter itself has failed. This clicking you hear is the solenoid on the starter attempting to engage the starter.

you need to remove it from the bottom front of car . disconnect the negative battery cable. remove the front splash shield from under front of car , working from under car take the protective cap off the wires that go to starter and then disconnect all wires from starter marking each one for propper reinstalation, remove the bolts holding starter and remove from under vehicle. replace in reverse order.