99 Cougar 4 cyl alternator

Read many posts re: alternator issues, I have not ran into help for the 4 cyl. alternator replacement. Can anyone recommend a good (free) site (already looked at auto zone) with pic's and step by step guide? From all that I have read it seems to me that there could be a big difference from the 4 cyl to the V6 when replacing them, is this true? To all that reply and help people here you guys seem so helpful, I would appreciate your help as well....Thank You in advance!