Try this awesome online converter:
http://www.zamzar.comSimply browse for your .pdf, select the format you wish to convert to (in your case .doc) and then enter your email address of where to send the .doc file.
Once you get the file, you can edit it easily (make sure you get permission from the .pdf creator of the file first!).
This program is 100% free and contains no viruses, spyware, adware.
If you have Office 2007, you can install an add-in from Microsoft to convert any Office file to .pdf format. Located
hereGood luck.