Difficult inserting a disc.

A friend of mine has an I-Mac and is having a problem with the CD/DVD drive.
Would anyone know how hard it is to replace the CD/DVD drive on the I-MAC?
Is there a web page that show how to do this?

Thanks

Cannot verify this and remember you do this at your own risk but check out the following:

http://forums.macrumors.com/archive/index.php/t-235972.html