I've spent so long trying to work this out that I think I now can't see the
wood for the trees.  I created my very first mail merge today in order to
send out 250 letters.  All was fine until I went to print it.  The first
letter was formatted perfectly on the paper, just where I wanted it to be.  
From then on however the text slipped further down the page until it was
completely out of synch; unfortunately I didn't notice until halfway through
the print run after I had used about 100 sheets of expensive headed paper.

I'm thinking it must be a problem with how the original letter was formatted
(I didn't do this part) but I can't for the life of me think how to correct
it so that the letter prints in the same place on every page.  As I said, I
have never created a mail merge before, and am only really familiar with
shifting text by using the delete and return buttons;  I've never got into
page breaks.  

Normally I would take the time to sort this out but time is something I
don't have, I just need somebody to suggest things that I could be doing
wrong and ways of putting them right.

Many thanks in advance, Chrissie