replacing front strut on 2005 convertible

The 2005 Ford Mustang uses the MacPherson strut. There are many DIY sites where you can find guides on how to replace the struts. Here is one: http://www.diynetwork.com/diy/ab_suspension/article/0,2021,DIY_13695_3065124,00.html It talks about the front strut a little more than half way down.

You may want to get a manual for the year's mustang

Autoguy is right. A Haynes repair manual can be your best friend if anything else comes up too. They cost $10-20 and are available at book stores and auto parts stores.