Print with the wrong paper size

I am using Word 2003 and have a document which was created using the paper
size of letter.
The 1st page is in portrait and then the other 48 pages are landscape.

Problem: I need to print this document and if I try to print it as it is
with the paper size set to letter, all the pages appear very small print in
the middle of the page. If I change the paper size to A4 when I print it
warns me that the text is outsize the margins and then the printing “falls�
off the right side of the page.

Please can anyone tell me how to get this document (Three weeks work) printed?

Thanks