You didn't mention whether the creator had used any paragraph styles; my educated guess is that he or she did not and that the entire document is in Normal. If you can get the author to use even a few styles, e.g., headings, a body text, and anything else particularly suited to the document, it will save lots of time in the future: by changing the style, everything with that style in the document will change accordingly, and you can navigate from heading to heading using GoTo, and so forth.