Consider using the Dreamweaver extension, ThemeDreamer. It turns Dreamweaver
into a WYSIWYG editor for WordPress themes. Open just about any WordPress theme
to get a visual approximation in Design View. It's great for customizing CSS,
drag n' drop/position blocks of code (just like you did with html in Dw), while
easily navigating code in CodeView, eliminate the need to guess/parse multiple
files (header.php, etc.) that make up a theme. Bonuses are code hints, context
sensitive documentation via the property sheet, no server required (work
offline), etc. Sure, Design View is just an approximation but it sure beats the
heck out of trial n' error for doing design.
Without it, you're missing out on alot of Dw's potential with WordPress.
Before/after screen shots speak for themselves:
http://www.themedreamer.com/demos
Hope that helps!