Currently Being ModeratedNov 6, 2012 8:07 PM (in response to garyconrad)
I don't think Preview can change wording in PDFs. It can annotate them.
Your best luck would probably be something like PDFPen or PDFPen Pro by Smile Software. Cost is $50 or $100, respectively, but they may have trial versions.
Currently Being ModeratedNov 6, 2012 9:33 PM (in response to garyconrad)
William is correct regarding PDFPen. Here's where to find it:
They do indeed offer a free trial. It's fully functional. The only thing it does that might inconvenience you is put their logo on any pages you might print.
I've used their product for several years and am a satisfied customer. I do not have any financial or other interest in the company or product.