Easiest way to update all paragraphs in a book

[Andersen, Verner Engell VEA]

Hi
We are goin to change all our Times New Roman 10 pt fonts to Verdana 9
pt fonts.
What is the easiest way to update all styles in the paragraph designer?
 
Right now, i have the following solutions:
 
1. Press ctrl+m and update each style in paragraph designer. Import
formats to whole book.
2. Save as .mif search and replace "Times New Roman" and "10 pt"
respectively. Save as .fm and import formats to whole book.
 
Is there an easier or safer solution?
 
Med venlig hilsen / Kind regards

Verner Andersen

Technical Writer
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Radiometer Medical ApS 
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