I am using Austin Ziegler's PDF::Writer to create invoices, which works pretty 
well. Now I am facing the need to add some text to the first page of the 
document later in the creation process, e.g. while I am already writing on 
page two. 

In the manual I found the following information:

PDF::Writer#first_page
The first page created during startup, useful for adding something to it 
later.

I just cannot figure out, how to add something later. Any ideas anyone ?

Thanks,
Holger von Ameln