I have all of 3 weeks experience with WordPress, coming previously from Dreamweaver- no other CMS experience. So I am very new to how themes and things work. For my wife's site, I selected the 2010 Weaver template because it had a look we liked, but as I get more experience I'm finding that this theme doesn't do everything I'd like despite several useful plug-ins I installed. So I'd like to experiment with a new theme and cut over when ready, without breaking what's working now.
Would Theme Switcher take care of this for me in a very non-destructive way? I want to find a template that will do things like have a featured post, a menu item for all posts except those in a particular category, etc. What are the gotchas I need to look out for when choosing new themes to work with so I don't mess up my current installation?