You should be able to see how a document will print out by doing a print preview first (look in the menus). Assuming that your font is the same size throughout, you could always do a select all (ctrl+A) and set your font size to something sensible like 12. This would ensure you have not set your font size to a crazily large size by default.
If you are still having problems, try saving your document in a RTF format (Save As...) and then open it and print it out with the standard Word Pad application that comes with Windows - see if that solves your problem.