Migrating site to WP mexperience?
 

I was planning torearange my site www.femdomdestiny.com and install wordpress on that domain. And I've already organized making custom template for it, and wanted to make new pages instead of existing one (to take content and make blog posts from every gallery I have there). But, I've just got info from respectable SEO guy that changing link structure can fuck me up completely, so I was wondering did someone already made something similar?

Or maybe I should keep all those pages there and continue updating site on wordpress and old pages put in some kind of archive. I am completely confused.
thanks