With the Find/Replace, you specify the Style to find as one of the Find parameters and the replacement Style as another parameter and only do the Replace once. The only time this might be an issue is if you do the Find/Replace, then update the document so that another instance of the word becomes the first instance. You could, of course, record the Find/Replace as a macro but that would only work for that particular word and I gather you have more than one word to find. A Find/Replace macro that processes multiple words could also be written but, unless, you're always working with the same set of words, you then have to consider how the list will be maintained.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]