Do you have Adobe Acrobat? If you want to modify PDF files, that is a requirement, the free Reader cannot modify files.
The best way to do this is to use an imposition tool (e.g. Quite Imposing, which is an Acrobat plug-in). The next best way is to print to the "Adobe PDF" Printer and select to use the appropriate paper size and select to "fit" the content. The "Adobe PDF" printer is only available on Windows.
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com