you will be cutting the drywall to fit the studs.
you may also be cutting the drywall into a manageable weight if you are
working without a helper or with heavier fire rated X.
if you are trying to get out of the job, check the unevenness of the
old studs with a laser level throughout the site first.
you must not shy away from buying drywall, cutting it to any size you
want, and taping and finishing it. unless your neighbor does it for you
buy some drywall tools on ebay and get the party started.

http://www.google.com/search?sourcei...o+hang+drywall
http://cgi.ebay.com/INNOVATIVE-DRYWA...c mdZViewItem